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Finding the Fourth Proportional to 42,689.70, 64,041.30 and 14,612.40

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Solution

The fourth proportional to 42,689.70, 64,041.30 and 14,612.40 is: 21,920.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,689.70 : 64,041.30 = 14,612.40 : x
  2. Step 2: Convert to fraction form
    42,689.70/64,041.30 = 14,612.40/x
  3. Step 3: Cross multiply
    42,689.70x = 64,041.30 × 14,612.40
  4. Step 4: Simplify right side
    42,689.70x = 935,797,092.12
  5. Step 5: Solve for x
    x = 935,797,092.12/42,689.70
  6. Step 6: Final answer
    x = 21,920.91

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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.