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Finding the Fourth Proportional to 1,207.18, 1,810.65 and 557.91

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Solution

The fourth proportional to 1,207.18, 1,810.65 and 557.91 is: 836.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.18 : 1,810.65 = 557.91 : x
  2. Step 2: Convert to fraction form
    1,207.18/1,810.65 = 557.91/x
  3. Step 3: Cross multiply
    1,207.18x = 1,810.65 × 557.91
  4. Step 4: Simplify right side
    1,207.18x = 1,010,179.74
  5. Step 5: Solve for x
    x = 1,010,179.74/1,207.18
  6. Step 6: Final answer
    x = 836.81

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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.