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Finding the Fourth Proportional to 985.32, 1,478 and 619

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Solution

The fourth proportional to 985.32, 1,478 and 619 is: 928.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.32 : 1,478 = 619 : x
  2. Step 2: Convert to fraction form
    985.32/1,478 = 619/x
  3. Step 3: Cross multiply
    985.32x = 1,478 × 619
  4. Step 4: Simplify right side
    985.32x = 914,882
  5. Step 5: Solve for x
    x = 914,882/985.32
  6. Step 6: Final answer
    x = 928.51

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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.