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Finding the Fourth Proportional to 39,689.59, 59,534.21 and 11,987.59

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Solution

The fourth proportional to 39,689.59, 59,534.21 and 11,987.59 is: 17,981.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,689.59 : 59,534.21 = 11,987.59 : x
  2. Step 2: Convert to fraction form
    39,689.59/59,534.21 = 11,987.59/x
  3. Step 3: Cross multiply
    39,689.59x = 59,534.21 × 11,987.59
  4. Step 4: Simplify right side
    39,689.59x = 713,671,640.52
  5. Step 5: Solve for x
    x = 713,671,640.52/39,689.59
  6. Step 6: Final answer
    x = 17,981.33

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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.