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Finding the Fourth Proportional to 908.32, 1,253.65 and 644.08

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Solution

The fourth proportional to 908.32, 1,253.65 and 644.08 is: 888.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.32 : 1,253.65 = 644.08 : x
  2. Step 2: Convert to fraction form
    908.32/1,253.65 = 644.08/x
  3. Step 3: Cross multiply
    908.32x = 1,253.65 × 644.08
  4. Step 4: Simplify right side
    908.32x = 807,450.89
  5. Step 5: Solve for x
    x = 807,450.89/908.32
  6. Step 6: Final answer
    x = 888.95

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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.