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Finding the Fourth Proportional to 1,985.92, 2,978.97 and 753.18

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Solution

The fourth proportional to 1,985.92, 2,978.97 and 753.18 is: 1,129.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,985.92 : 2,978.97 = 753.18 : x
  2. Step 2: Convert to fraction form
    1,985.92/2,978.97 = 753.18/x
  3. Step 3: Cross multiply
    1,985.92x = 2,978.97 × 753.18
  4. Step 4: Simplify right side
    1,985.92x = 2,243,700.62
  5. Step 5: Solve for x
    x = 2,243,700.62/1,985.92
  6. Step 6: Final answer
    x = 1,129.80

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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.