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Finding the Fourth Proportional to 42,690.70, 64,042.80 and 14,613.40

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Solution

The fourth proportional to 42,690.70, 64,042.80 and 14,613.40 is: 21,922.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,690.70 : 64,042.80 = 14,613.40 : x
  2. Step 2: Convert to fraction form
    42,690.70/64,042.80 = 14,613.40/x
  3. Step 3: Cross multiply
    42,690.70x = 64,042.80 × 14,613.40
  4. Step 4: Simplify right side
    42,690.70x = 935,883,053.52
  5. Step 5: Solve for x
    x = 935,883,053.52/42,690.70
  6. Step 6: Final answer
    x = 21,922.41

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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.