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Finding the Fourth Proportional to 772.95, 1,158.08 and 643.78

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Solution

The fourth proportional to 772.95, 1,158.08 and 643.78 is: 964.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.95 : 1,158.08 = 643.78 : x
  2. Step 2: Convert to fraction form
    772.95/1,158.08 = 643.78/x
  3. Step 3: Cross multiply
    772.95x = 1,158.08 × 643.78
  4. Step 4: Simplify right side
    772.95x = 745,549.87
  5. Step 5: Solve for x
    x = 745,549.87/772.95
  6. Step 6: Final answer
    x = 964.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.