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Finding the Fourth Proportional to 71,639.91, 98,866.44 and 39,809.07

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Solution

The fourth proportional to 71,639.91, 98,866.44 and 39,809.07 is: 54,938.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,639.91 : 98,866.44 = 39,809.07 : x
  2. Step 2: Convert to fraction form
    71,639.91/98,866.44 = 39,809.07/x
  3. Step 3: Cross multiply
    71,639.91x = 98,866.44 × 39,809.07
  4. Step 4: Simplify right side
    71,639.91x = 3,935,781,030.61
  5. Step 5: Solve for x
    x = 3,935,781,030.61/71,639.91
  6. Step 6: Final answer
    x = 54,938.39

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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.