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Finding the Fourth Proportional to 39,681.78, 59,522.70 and 11,979.78

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Solution

The fourth proportional to 39,681.78, 59,522.70 and 11,979.78 is: 17,969.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,681.78 : 59,522.70 = 11,979.78 : x
  2. Step 2: Convert to fraction form
    39,681.78/59,522.70 = 11,979.78/x
  3. Step 3: Cross multiply
    39,681.78x = 59,522.70 × 11,979.78
  4. Step 4: Simplify right side
    39,681.78x = 713,068,851.01
  5. Step 5: Solve for x
    x = 713,068,851.01/39,681.78
  6. Step 6: Final answer
    x = 17,969.68

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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.