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Finding the Fourth Proportional to 979.18, 1,466.78 and 458.45

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Solution

The fourth proportional to 979.18, 1,466.78 and 458.45 is: 686.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.18 : 1,466.78 = 458.45 : x
  2. Step 2: Convert to fraction form
    979.18/1,466.78 = 458.45/x
  3. Step 3: Cross multiply
    979.18x = 1,466.78 × 458.45
  4. Step 4: Simplify right side
    979.18x = 672,443.00
  5. Step 5: Solve for x
    x = 672,443.00/979.18
  6. Step 6: Final answer
    x = 686.74

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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.