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Finding the Fourth Proportional to 979.42, 1,351.47 and 630.58

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Solution

The fourth proportional to 979.42, 1,351.47 and 630.58 is: 870.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.42 : 1,351.47 = 630.58 : x
  2. Step 2: Convert to fraction form
    979.42/1,351.47 = 630.58/x
  3. Step 3: Cross multiply
    979.42x = 1,351.47 × 630.58
  4. Step 4: Simplify right side
    979.42x = 852,209.95
  5. Step 5: Solve for x
    x = 852,209.95/979.42
  6. Step 6: Final answer
    x = 870.12

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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.