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Finding the Fourth Proportional to 862.42, 1,191.28 and 638.81

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Solution

The fourth proportional to 862.42, 1,191.28 and 638.81 is: 882.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.42 : 1,191.28 = 638.81 : x
  2. Step 2: Convert to fraction form
    862.42/1,191.28 = 638.81/x
  3. Step 3: Cross multiply
    862.42x = 1,191.28 × 638.81
  4. Step 4: Simplify right side
    862.42x = 761,004.84
  5. Step 5: Solve for x
    x = 761,004.84/862.42
  6. Step 6: Final answer
    x = 882.40

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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.