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Finding the Fourth Proportional to 42,655.80, 63,976.32 and 19,276.80

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Solution

The fourth proportional to 42,655.80, 63,976.32 and 19,276.80 is: 28,911.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,655.80 : 63,976.32 = 19,276.80 : x
  2. Step 2: Convert to fraction form
    42,655.80/63,976.32 = 19,276.80/x
  3. Step 3: Cross multiply
    42,655.80x = 63,976.32 × 19,276.80
  4. Step 4: Simplify right side
    42,655.80x = 1,233,258,725.38
  5. Step 5: Solve for x
    x = 1,233,258,725.38/42,655.80
  6. Step 6: Final answer
    x = 28,911.86

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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.