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Finding the Fourth Proportional to 57,447.20, 86,000.70 and 42,721.40

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Solution

The fourth proportional to 57,447.20, 86,000.70 and 42,721.40 is: 63,955.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,447.20 : 86,000.70 = 42,721.40 : x
  2. Step 2: Convert to fraction form
    57,447.20/86,000.70 = 42,721.40/x
  3. Step 3: Cross multiply
    57,447.20x = 86,000.70 × 42,721.40
  4. Step 4: Simplify right side
    57,447.20x = 3,674,070,304.98
  5. Step 5: Solve for x
    x = 3,674,070,304.98/57,447.20
  6. Step 6: Final answer
    x = 63,955.60

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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.