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Finding the Fourth Proportional to 781.63, 1,079.09 and 520.00

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Solution

The fourth proportional to 781.63, 1,079.09 and 520.00 is: 717.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.63 : 1,079.09 = 520.00 : x
  2. Step 2: Convert to fraction form
    781.63/1,079.09 = 520.00/x
  3. Step 3: Cross multiply
    781.63x = 1,079.09 × 520.00
  4. Step 4: Simplify right side
    781.63x = 561,123.45
  5. Step 5: Solve for x
    x = 561,123.45/781.63
  6. Step 6: Final answer
    x = 717.89

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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.