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Finding the Fourth Proportional to 870.90, 1,201.81 and 497.87

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Solution

The fourth proportional to 870.90, 1,201.81 and 497.87 is: 687.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.90 : 1,201.81 = 497.87 : x
  2. Step 2: Convert to fraction form
    870.90/1,201.81 = 497.87/x
  3. Step 3: Cross multiply
    870.90x = 1,201.81 × 497.87
  4. Step 4: Simplify right side
    870.90x = 598,345.42
  5. Step 5: Solve for x
    x = 598,345.42/870.90
  6. Step 6: Final answer
    x = 687.04

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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.