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Finding the Fourth Proportional to 851.57, 1,175.66 and 557.35

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Solution

The fourth proportional to 851.57, 1,175.66 and 557.35 is: 769.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.57 : 1,175.66 = 557.35 : x
  2. Step 2: Convert to fraction form
    851.57/1,175.66 = 557.35/x
  3. Step 3: Cross multiply
    851.57x = 1,175.66 × 557.35
  4. Step 4: Simplify right side
    851.57x = 655,254.10
  5. Step 5: Solve for x
    x = 655,254.10/851.57
  6. Step 6: Final answer
    x = 769.47

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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.