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Finding the Fourth Proportional to 870.37, 1,201.10 and 477.38

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Solution

The fourth proportional to 870.37, 1,201.10 and 477.38 is: 658.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.37 : 1,201.10 = 477.38 : x
  2. Step 2: Convert to fraction form
    870.37/1,201.10 = 477.38/x
  3. Step 3: Cross multiply
    870.37x = 1,201.10 × 477.38
  4. Step 4: Simplify right side
    870.37x = 573,381.12
  5. Step 5: Solve for x
    x = 573,381.12/870.37
  6. Step 6: Final answer
    x = 658.78

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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.