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Finding the Fourth Proportional to 698.10, 962.18 and 557.72

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Solution

The fourth proportional to 698.10, 962.18 and 557.72 is: 768.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.10 : 962.18 = 557.72 : x
  2. Step 2: Convert to fraction form
    698.10/962.18 = 557.72/x
  3. Step 3: Cross multiply
    698.10x = 962.18 × 557.72
  4. Step 4: Simplify right side
    698.10x = 536,627.03
  5. Step 5: Solve for x
    x = 536,627.03/698.10
  6. Step 6: Final answer
    x = 768.70

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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.