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Finding the Fourth Proportional to 979.56, 1,351.52 and 647.88

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Solution

The fourth proportional to 979.56, 1,351.52 and 647.88 is: 893.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.56 : 1,351.52 = 647.88 : x
  2. Step 2: Convert to fraction form
    979.56/1,351.52 = 647.88/x
  3. Step 3: Cross multiply
    979.56x = 1,351.52 × 647.88
  4. Step 4: Simplify right side
    979.56x = 875,622.78
  5. Step 5: Solve for x
    x = 875,622.78/979.56
  6. Step 6: Final answer
    x = 893.89

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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.