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Finding the Fourth Proportional to 280,916.82, 421,371 and 91,385.82

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Solution

The fourth proportional to 280,916.82, 421,371 and 91,385.82 is: 137,077.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,916.82 : 421,371 = 91,385.82 : x
  2. Step 2: Convert to fraction form
    280,916.82/421,371 = 91,385.82/x
  3. Step 3: Cross multiply
    280,916.82x = 421,371 × 91,385.82
  4. Step 4: Simplify right side
    280,916.82x = 38,507,334,359.22
  5. Step 5: Solve for x
    x = 38,507,334,359.22/280,916.82
  6. Step 6: Final answer
    x = 137,077.35

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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.