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Finding the Fourth Proportional to 867.11, 1,300.10 and 520.70

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Solution

The fourth proportional to 867.11, 1,300.10 and 520.70 is: 780.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    867.11 : 1,300.10 = 520.70 : x
  2. Step 2: Convert to fraction form
    867.11/1,300.10 = 520.70/x
  3. Step 3: Cross multiply
    867.11x = 1,300.10 × 520.70
  4. Step 4: Simplify right side
    867.11x = 676,962.72
  5. Step 5: Solve for x
    x = 676,962.72/867.11
  6. Step 6: Final answer
    x = 780.71

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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.