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Finding the Fourth Proportional to 28,605.60, 39,436.20 and 17,989.20

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Solution

The fourth proportional to 28,605.60, 39,436.20 and 17,989.20 is: 24,800.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,605.60 : 39,436.20 = 17,989.20 : x
  2. Step 2: Convert to fraction form
    28,605.60/39,436.20 = 17,989.20/x
  3. Step 3: Cross multiply
    28,605.60x = 39,436.20 × 17,989.20
  4. Step 4: Simplify right side
    28,605.60x = 709,425,689.04
  5. Step 5: Solve for x
    x = 709,425,689.04/28,605.60
  6. Step 6: Final answer
    x = 24,800.24

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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.