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Finding the Fourth Proportional to 865.47, 1,291.89 and 761.67

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Solution

The fourth proportional to 865.47, 1,291.89 and 761.67 is: 1,136.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.47 : 1,291.89 = 761.67 : x
  2. Step 2: Convert to fraction form
    865.47/1,291.89 = 761.67/x
  3. Step 3: Cross multiply
    865.47x = 1,291.89 × 761.67
  4. Step 4: Simplify right side
    865.47x = 983,993.86
  5. Step 5: Solve for x
    x = 983,993.86/865.47
  6. Step 6: Final answer
    x = 1,136.95

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.