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Finding the Fourth Proportional to 870.55, 1,201.32 and 477.56

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Solution

The fourth proportional to 870.55, 1,201.32 and 477.56 is: 659.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.55 : 1,201.32 = 477.56 : x
  2. Step 2: Convert to fraction form
    870.55/1,201.32 = 477.56/x
  3. Step 3: Cross multiply
    870.55x = 1,201.32 × 477.56
  4. Step 4: Simplify right side
    870.55x = 573,705.69
  5. Step 5: Solve for x
    x = 573,705.69/870.55
  6. Step 6: Final answer
    x = 659.02

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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.