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Finding the Fourth Proportional to 768.96, 1,061.10 and 474.21

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Solution

The fourth proportional to 768.96, 1,061.10 and 474.21 is: 654.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.96 : 1,061.10 = 474.21 : x
  2. Step 2: Convert to fraction form
    768.96/1,061.10 = 474.21/x
  3. Step 3: Cross multiply
    768.96x = 1,061.10 × 474.21
  4. Step 4: Simplify right side
    768.96x = 503,184.23
  5. Step 5: Solve for x
    x = 503,184.23/768.96
  6. Step 6: Final answer
    x = 654.37

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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.