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Finding the Fourth Proportional to 937.08, 1,292.76 and 642.72

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Solution

The fourth proportional to 937.08, 1,292.76 and 642.72 is: 886.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    937.08 : 1,292.76 = 642.72 : x
  2. Step 2: Convert to fraction form
    937.08/1,292.76 = 642.72/x
  3. Step 3: Cross multiply
    937.08x = 1,292.76 × 642.72
  4. Step 4: Simplify right side
    937.08x = 830,882.71
  5. Step 5: Solve for x
    x = 830,882.71/937.08
  6. Step 6: Final answer
    x = 886.67

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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.