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Finding the Fourth Proportional to 1,247.70, 1,869.72 and 883.20

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Solution

The fourth proportional to 1,247.70, 1,869.72 and 883.20 is: 1,323.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.70 : 1,869.72 = 883.20 : x
  2. Step 2: Convert to fraction form
    1,247.70/1,869.72 = 883.20/x
  3. Step 3: Cross multiply
    1,247.70x = 1,869.72 × 883.20
  4. Step 4: Simplify right side
    1,247.70x = 1,651,336.70
  5. Step 5: Solve for x
    x = 1,651,336.70/1,247.70
  6. Step 6: Final answer
    x = 1,323.50

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Double scale
Find fourth proportional to 1,248.70, 1,871.22 and 884.20
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.