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Finding the Fourth Proportional to 857,985.70, 1,286,978.55 and 218,288.20

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Solution

The fourth proportional to 857,985.70, 1,286,978.55 and 218,288.20 is: 327,432.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    857,985.70 : 1,286,978.55 = 218,288.20 : x
  2. Step 2: Convert to fraction form
    857,985.70/1,286,978.55 = 218,288.20/x
  3. Step 3: Cross multiply
    857,985.70x = 1,286,978.55 × 218,288.20
  4. Step 4: Simplify right side
    857,985.70x = 280,932,231,118.11
  5. Step 5: Solve for x
    x = 280,932,231,118.11/857,985.70
  6. Step 6: Final answer
    x = 327,432.30

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.