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Finding the Fourth Proportional to 870.91, 1,201.90 and 517.04

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Solution

The fourth proportional to 870.91, 1,201.90 and 517.04 is: 713.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.91 : 1,201.90 = 517.04 : x
  2. Step 2: Convert to fraction form
    870.91/1,201.90 = 517.04/x
  3. Step 3: Cross multiply
    870.91x = 1,201.90 × 517.04
  4. Step 4: Simplify right side
    870.91x = 621,430.38
  5. Step 5: Solve for x
    x = 621,430.38/870.91
  6. Step 6: Final answer
    x = 713.54

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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.