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Finding the Fourth Proportional to 42,505.58, 63,760.64 and 12,921.14

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Solution

The fourth proportional to 42,505.58, 63,760.64 and 12,921.14 is: 19,382.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,505.58 : 63,760.64 = 12,921.14 : x
  2. Step 2: Convert to fraction form
    42,505.58/63,760.64 = 12,921.14/x
  3. Step 3: Cross multiply
    42,505.58x = 63,760.64 × 12,921.14
  4. Step 4: Simplify right side
    42,505.58x = 823,859,772.52
  5. Step 5: Solve for x
    x = 823,859,772.52/42,505.58
  6. Step 6: Final answer
    x = 19,382.39

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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.