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Finding the Fourth Proportional to 836.89, 1,155.31 and 557.59

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Solution

The fourth proportional to 836.89, 1,155.31 and 557.59 is: 769.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    836.89 : 1,155.31 = 557.59 : x
  2. Step 2: Convert to fraction form
    836.89/1,155.31 = 557.59/x
  3. Step 3: Cross multiply
    836.89x = 1,155.31 × 557.59
  4. Step 4: Simplify right side
    836.89x = 644,186.51
  5. Step 5: Solve for x
    x = 644,186.51/836.89
  6. Step 6: Final answer
    x = 769.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.