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Finding the Fourth Proportional to 768.55, 1,061.67 and 685.62

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Solution

The fourth proportional to 768.55, 1,061.67 and 685.62 is: 947.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.55 : 1,061.67 = 685.62 : x
  2. Step 2: Convert to fraction form
    768.55/1,061.67 = 685.62/x
  3. Step 3: Cross multiply
    768.55x = 1,061.67 × 685.62
  4. Step 4: Simplify right side
    768.55x = 727,902.19
  5. Step 5: Solve for x
    x = 727,902.19/768.55
  6. Step 6: Final answer
    x = 947.11

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1.5x scale

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.