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Finding the Fourth Proportional to 925.79, 1,278.64 and 630.55

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Solution

The fourth proportional to 925.79, 1,278.64 and 630.55 is: 870.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.79 : 1,278.64 = 630.55 : x
  2. Step 2: Convert to fraction form
    925.79/1,278.64 = 630.55/x
  3. Step 3: Cross multiply
    925.79x = 1,278.64 × 630.55
  4. Step 4: Simplify right side
    925.79x = 806,240.06
  5. Step 5: Solve for x
    x = 806,240.06/925.79
  6. Step 6: Final answer
    x = 870.87

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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.