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Finding the Fourth Proportional to 42,643.80, 63,965.70 and 13,061.40

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Solution

The fourth proportional to 42,643.80, 63,965.70 and 13,061.40 is: 19,592.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,643.80 : 63,965.70 = 13,061.40 : x
  2. Step 2: Convert to fraction form
    42,643.80/63,965.70 = 13,061.40/x
  3. Step 3: Cross multiply
    42,643.80x = 63,965.70 × 13,061.40
  4. Step 4: Simplify right side
    42,643.80x = 835,481,593.98
  5. Step 5: Solve for x
    x = 835,481,593.98/42,643.80
  6. Step 6: Final answer
    x = 19,592.10

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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.