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Finding the Fourth Proportional to 979.55, 1,348.38 and 854.99

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Solution

The fourth proportional to 979.55, 1,348.38 and 854.99 is: 1,176.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.55 : 1,348.38 = 854.99 : x
  2. Step 2: Convert to fraction form
    979.55/1,348.38 = 854.99/x
  3. Step 3: Cross multiply
    979.55x = 1,348.38 × 854.99
  4. Step 4: Simplify right side
    979.55x = 1,152,844.67
  5. Step 5: Solve for x
    x = 1,152,844.67/979.55
  6. Step 6: Final answer
    x = 1,176.92

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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.