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Finding the Fourth Proportional to 864.86, 1,190.59 and 781.72

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Solution

The fourth proportional to 864.86, 1,190.59 and 781.72 is: 1,076.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.86 : 1,190.59 = 781.72 : x
  2. Step 2: Convert to fraction form
    864.86/1,190.59 = 781.72/x
  3. Step 3: Cross multiply
    864.86x = 1,190.59 × 781.72
  4. Step 4: Simplify right side
    864.86x = 930,708.01
  5. Step 5: Solve for x
    x = 930,708.01/864.86
  6. Step 6: Final answer
    x = 1,076.14

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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.