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Finding the Fourth Proportional to 280,881.31, 421,236.28 and 147,689.31

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Solution

The fourth proportional to 280,881.31, 421,236.28 and 147,689.31 is: 221,488.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,881.31 : 421,236.28 = 147,689.31 : x
  2. Step 2: Convert to fraction form
    280,881.31/421,236.28 = 147,689.31/x
  3. Step 3: Cross multiply
    280,881.31x = 421,236.28 × 147,689.31
  4. Step 4: Simplify right side
    280,881.31x = 62,212,095,540.17
  5. Step 5: Solve for x
    x = 62,212,095,540.17/280,881.31
  6. Step 6: Final answer
    x = 221,488.91

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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.