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Finding the Fourth Proportional to 953.20, 1,316.04 and 638.92

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Solution

The fourth proportional to 953.20, 1,316.04 and 638.92 is: 882.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    953.20 : 1,316.04 = 638.92 : x
  2. Step 2: Convert to fraction form
    953.20/1,316.04 = 638.92/x
  3. Step 3: Cross multiply
    953.20x = 1,316.04 × 638.92
  4. Step 4: Simplify right side
    953.20x = 840,844.28
  5. Step 5: Solve for x
    x = 840,844.28/953.20
  6. Step 6: Final answer
    x = 882.13

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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.