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Finding the Fourth Proportional to 1,207.31, 1,811.12 and 558

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Solution

The fourth proportional to 1,207.31, 1,811.12 and 558 is: 837.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.31 : 1,811.12 = 558 : x
  2. Step 2: Convert to fraction form
    1,207.31/1,811.12 = 558/x
  3. Step 3: Cross multiply
    1,207.31x = 1,811.12 × 558
  4. Step 4: Simplify right side
    1,207.31x = 1,010,602.17
  5. Step 5: Solve for x
    x = 1,010,602.17/1,207.31
  6. Step 6: Final answer
    x = 837.07

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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.