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Finding the Fourth Proportional to 64,987.70, 89,689.01 and 39,488.18

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Solution

The fourth proportional to 64,987.70, 89,689.01 and 39,488.18 is: 54,497.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,987.70 : 89,689.01 = 39,488.18 : x
  2. Step 2: Convert to fraction form
    64,987.70/89,689.01 = 39,488.18/x
  3. Step 3: Cross multiply
    64,987.70x = 89,689.01 × 39,488.18
  4. Step 4: Simplify right side
    64,987.70x = 3,541,655,125.02
  5. Step 5: Solve for x
    x = 3,541,655,125.02/64,987.70
  6. Step 6: Final answer
    x = 54,497.32

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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.