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Finding the Fourth Proportional to 862.68, 1,191.06 and 630.84

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Solution

The fourth proportional to 862.68, 1,191.06 and 630.84 is: 870.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.68 : 1,191.06 = 630.84 : x
  2. Step 2: Convert to fraction form
    862.68/1,191.06 = 630.84/x
  3. Step 3: Cross multiply
    862.68x = 1,191.06 × 630.84
  4. Step 4: Simplify right side
    862.68x = 751,368.29
  5. Step 5: Solve for x
    x = 751,368.29/862.68
  6. Step 6: Final answer
    x = 870.97

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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.