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Finding the Fourth Proportional to 425,262.48, 638,289 and 215,051.28

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Solution

The fourth proportional to 425,262.48, 638,289 and 215,051.28 is: 322,776.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,262.48 : 638,289 = 215,051.28 : x
  2. Step 2: Convert to fraction form
    425,262.48/638,289 = 215,051.28/x
  3. Step 3: Cross multiply
    425,262.48x = 638,289 × 215,051.28
  4. Step 4: Simplify right side
    425,262.48x = 137,264,866,459.92
  5. Step 5: Solve for x
    x = 137,264,866,459.92/425,262.48
  6. Step 6: Final answer
    x = 322,776.81

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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.