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Finding the Fourth Proportional to 674.40, 929.88 and 425.40

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Solution

The fourth proportional to 674.40, 929.88 and 425.40 is: 586.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.40 : 929.88 = 425.40 : x
  2. Step 2: Convert to fraction form
    674.40/929.88 = 425.40/x
  3. Step 3: Cross multiply
    674.40x = 929.88 × 425.40
  4. Step 4: Simplify right side
    674.40x = 395,570.95
  5. Step 5: Solve for x
    x = 395,570.95/674.40
  6. Step 6: Final answer
    x = 586.55

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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.