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Finding the Fourth Proportional to 425,643.61, 638,465.42 and 145,163.29

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Solution

The fourth proportional to 425,643.61, 638,465.42 and 145,163.29 is: 217,744.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,643.61 : 638,465.42 = 145,163.29 : x
  2. Step 2: Convert to fraction form
    425,643.61/638,465.42 = 145,163.29/x
  3. Step 3: Cross multiply
    425,643.61x = 638,465.42 × 145,163.29
  4. Step 4: Simplify right side
    425,643.61x = 92,681,740,192.62
  5. Step 5: Solve for x
    x = 92,681,740,192.62/425,643.61
  6. Step 6: Final answer
    x = 217,744.94

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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.