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Finding the Fourth Proportional to 870.55, 1,201.20 and 497.65

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Solution

The fourth proportional to 870.55, 1,201.20 and 497.65 is: 686.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.55 : 1,201.20 = 497.65 : x
  2. Step 2: Convert to fraction form
    870.55/1,201.20 = 497.65/x
  3. Step 3: Cross multiply
    870.55x = 1,201.20 × 497.65
  4. Step 4: Simplify right side
    870.55x = 597,774.56
  5. Step 5: Solve for x
    x = 597,774.56/870.55
  6. Step 6: Final answer
    x = 686.66

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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.