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Finding the Fourth Proportional to 768.40, 1,060.40 and 591.55

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Solution

The fourth proportional to 768.40, 1,060.40 and 591.55 is: 816.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.40 : 1,060.40 = 591.55 : x
  2. Step 2: Convert to fraction form
    768.40/1,060.40 = 591.55/x
  3. Step 3: Cross multiply
    768.40x = 1,060.40 × 591.55
  4. Step 4: Simplify right side
    768.40x = 627,278.45
  5. Step 5: Solve for x
    x = 627,278.45/768.40
  6. Step 6: Final answer
    x = 816.35

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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.