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Finding the Fourth Proportional to 42,439.68, 63,348 and 39,312

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Solution

The fourth proportional to 42,439.68, 63,348 and 39,312 is: 58,679.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,439.68 : 63,348 = 39,312 : x
  2. Step 2: Convert to fraction form
    42,439.68/63,348 = 39,312/x
  3. Step 3: Cross multiply
    42,439.68x = 63,348 × 39,312
  4. Step 4: Simplify right side
    42,439.68x = 2,490,336,576
  5. Step 5: Solve for x
    x = 2,490,336,576/42,439.68
  6. Step 6: Final answer
    x = 58,679.44

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.