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Finding the Fourth Proportional to 71,643.60, 98,863.20 and 39,810.60

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Solution

The fourth proportional to 71,643.60, 98,863.20 and 39,810.60 is: 54,935.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,643.60 : 98,863.20 = 39,810.60 : x
  2. Step 2: Convert to fraction form
    71,643.60/98,863.20 = 39,810.60/x
  3. Step 3: Cross multiply
    71,643.60x = 98,863.20 × 39,810.60
  4. Step 4: Simplify right side
    71,643.60x = 3,935,803,309.92
  5. Step 5: Solve for x
    x = 3,935,803,309.92/71,643.60
  6. Step 6: Final answer
    x = 54,935.87

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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.