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Finding the Fourth Proportional to 870.80, 1,201.71 and 477.83

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Solution

The fourth proportional to 870.80, 1,201.71 and 477.83 is: 659.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.80 : 1,201.71 = 477.83 : x
  2. Step 2: Convert to fraction form
    870.80/1,201.71 = 477.83/x
  3. Step 3: Cross multiply
    870.80x = 1,201.71 × 477.83
  4. Step 4: Simplify right side
    870.80x = 574,204.69
  5. Step 5: Solve for x
    x = 574,204.69/870.80
  6. Step 6: Final answer
    x = 659.40

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Double scale
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1.5x scale

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.