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Finding the Fourth Proportional to 769.70, 1,061.75 and 520.58

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Solution

The fourth proportional to 769.70, 1,061.75 and 520.58 is: 718.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.70 : 1,061.75 = 520.58 : x
  2. Step 2: Convert to fraction form
    769.70/1,061.75 = 520.58/x
  3. Step 3: Cross multiply
    769.70x = 1,061.75 × 520.58
  4. Step 4: Simplify right side
    769.70x = 552,723.21
  5. Step 5: Solve for x
    x = 552,723.21/769.70
  6. Step 6: Final answer
    x = 718.10

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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.