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Finding the Fourth Proportional to 768.74, 1,061.21 and 474.18

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Solution

The fourth proportional to 768.74, 1,061.21 and 474.18 is: 654.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.74 : 1,061.21 = 474.18 : x
  2. Step 2: Convert to fraction form
    768.74/1,061.21 = 474.18/x
  3. Step 3: Cross multiply
    768.74x = 1,061.21 × 474.18
  4. Step 4: Simplify right side
    768.74x = 503,199.25
  5. Step 5: Solve for x
    x = 503,199.25/768.74
  6. Step 6: Final answer
    x = 654.58

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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.