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Finding the Fourth Proportional to 71,638.64, 98,862.40 and 39,809.60

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Solution

The fourth proportional to 71,638.64, 98,862.40 and 39,809.60 is: 54,937.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,638.64 : 98,862.40 = 39,809.60 : x
  2. Step 2: Convert to fraction form
    71,638.64/98,862.40 = 39,809.60/x
  3. Step 3: Cross multiply
    71,638.64x = 98,862.40 × 39,809.60
  4. Step 4: Simplify right side
    71,638.64x = 3,935,672,599.04
  5. Step 5: Solve for x
    x = 3,935,672,599.04/71,638.64
  6. Step 6: Final answer
    x = 54,937.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.