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Finding the Fourth Proportional to 740.96, 1,112.16 and 638.72

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Solution

The fourth proportional to 740.96, 1,112.16 and 638.72 is: 958.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.96 : 1,112.16 = 638.72 : x
  2. Step 2: Convert to fraction form
    740.96/1,112.16 = 638.72/x
  3. Step 3: Cross multiply
    740.96x = 1,112.16 × 638.72
  4. Step 4: Simplify right side
    740.96x = 710,358.84
  5. Step 5: Solve for x
    x = 710,358.84/740.96
  6. Step 6: Final answer
    x = 958.70

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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.