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Finding the Fourth Proportional to 40,389, 60,585.66 and 12,689.16

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Solution

The fourth proportional to 40,389, 60,585.66 and 12,689.16 is: 19,034.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,389 : 60,585.66 = 12,689.16 : x
  2. Step 2: Convert to fraction form
    40,389/60,585.66 = 12,689.16/x
  3. Step 3: Cross multiply
    40,389x = 60,585.66 × 12,689.16
  4. Step 4: Simplify right side
    40,389x = 768,781,133.45
  5. Step 5: Solve for x
    x = 768,781,133.45/40,389
  6. Step 6: Final answer
    x = 19,034.42

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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.