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Finding the Fourth Proportional to 274,428.78, 411,638.69 and 87,437.74

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Solution

The fourth proportional to 274,428.78, 411,638.69 and 87,437.74 is: 131,155.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    274,428.78 : 411,638.69 = 87,437.74 : x
  2. Step 2: Convert to fraction form
    274,428.78/411,638.69 = 87,437.74/x
  3. Step 3: Cross multiply
    274,428.78x = 411,638.69 × 87,437.74
  4. Step 4: Simplify right side
    274,428.78x = 35,992,756,750.16
  5. Step 5: Solve for x
    x = 35,992,756,750.16/274,428.78
  6. Step 6: Final answer
    x = 131,155.18

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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.