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Finding the Fourth Proportional to 42,368.67, 63,553.47 and 12,786.78

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Solution

The fourth proportional to 42,368.67, 63,553.47 and 12,786.78 is: 19,180.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,368.67 : 63,553.47 = 12,786.78 : x
  2. Step 2: Convert to fraction form
    42,368.67/63,553.47 = 12,786.78/x
  3. Step 3: Cross multiply
    42,368.67x = 63,553.47 × 12,786.78
  4. Step 4: Simplify right side
    42,368.67x = 812,644,239.13
  5. Step 5: Solve for x
    x = 812,644,239.13/42,368.67
  6. Step 6: Final answer
    x = 19,180.31

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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.