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Finding the Fourth Proportional to 870.85, 1,201.79 and 477.90

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Solution

The fourth proportional to 870.85, 1,201.79 and 477.90 is: 659.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.85 : 1,201.79 = 477.90 : x
  2. Step 2: Convert to fraction form
    870.85/1,201.79 = 477.90/x
  3. Step 3: Cross multiply
    870.85x = 1,201.79 × 477.90
  4. Step 4: Simplify right side
    870.85x = 574,327.04
  5. Step 5: Solve for x
    x = 574,327.04/870.85
  6. Step 6: Final answer
    x = 659.51

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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.