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Finding the Fourth Proportional to 870.96, 1,201.72 and 637.68

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Solution

The fourth proportional to 870.96, 1,201.72 and 637.68 is: 879.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.96 : 1,201.72 = 637.68 : x
  2. Step 2: Convert to fraction form
    870.96/1,201.72 = 637.68/x
  3. Step 3: Cross multiply
    870.96x = 1,201.72 × 637.68
  4. Step 4: Simplify right side
    870.96x = 766,312.81
  5. Step 5: Solve for x
    x = 766,312.81/870.96
  6. Step 6: Final answer
    x = 879.85

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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.