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Finding the Fourth Proportional to 747.70, 1,121.55 and 637.78

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Solution

The fourth proportional to 747.70, 1,121.55 and 637.78 is: 956.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.70 : 1,121.55 = 637.78 : x
  2. Step 2: Convert to fraction form
    747.70/1,121.55 = 637.78/x
  3. Step 3: Cross multiply
    747.70x = 1,121.55 × 637.78
  4. Step 4: Simplify right side
    747.70x = 715,302.16
  5. Step 5: Solve for x
    x = 715,302.16/747.70
  6. Step 6: Final answer
    x = 956.67

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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.