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Finding the Fourth Proportional to 979.40, 1,351.54 and 630.28

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Solution

The fourth proportional to 979.40, 1,351.54 and 630.28 is: 869.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.40 : 1,351.54 = 630.28 : x
  2. Step 2: Convert to fraction form
    979.40/1,351.54 = 630.28/x
  3. Step 3: Cross multiply
    979.40x = 1,351.54 × 630.28
  4. Step 4: Simplify right side
    979.40x = 851,848.63
  5. Step 5: Solve for x
    x = 851,848.63/979.40
  6. Step 6: Final answer
    x = 869.77

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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.