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Finding the Fourth Proportional to 978.88, 1,351.73 and 630.17

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Solution

The fourth proportional to 978.88, 1,351.73 and 630.17 is: 870.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.88 : 1,351.73 = 630.17 : x
  2. Step 2: Convert to fraction form
    978.88/1,351.73 = 630.17/x
  3. Step 3: Cross multiply
    978.88x = 1,351.73 × 630.17
  4. Step 4: Simplify right side
    978.88x = 851,816.54
  5. Step 5: Solve for x
    x = 851,816.54/978.88
  6. Step 6: Final answer
    x = 870.20

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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.