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Finding the Fourth Proportional to 42,502.55, 63,756.11 and 12,918.16

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Solution

The fourth proportional to 42,502.55, 63,756.11 and 12,918.16 is: 19,377.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,502.55 : 63,756.11 = 12,918.16 : x
  2. Step 2: Convert to fraction form
    42,502.55/63,756.11 = 12,918.16/x
  3. Step 3: Cross multiply
    42,502.55x = 63,756.11 × 12,918.16
  4. Step 4: Simplify right side
    42,502.55x = 823,611,502.86
  5. Step 5: Solve for x
    x = 823,611,502.86/42,502.55
  6. Step 6: Final answer
    x = 19,377.93

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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.