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Finding the Fourth Proportional to 57,428.80, 86,143.15 and 17,988.99

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Solution

The fourth proportional to 57,428.80, 86,143.15 and 17,988.99 is: 26,983.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,428.80 : 86,143.15 = 17,988.99 : x
  2. Step 2: Convert to fraction form
    57,428.80/86,143.15 = 17,988.99/x
  3. Step 3: Cross multiply
    57,428.80x = 86,143.15 × 17,988.99
  4. Step 4: Simplify right side
    57,428.80x = 1,549,627,862.18
  5. Step 5: Solve for x
    x = 1,549,627,862.18/57,428.80
  6. Step 6: Final answer
    x = 26,983.46

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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.