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Finding the Fourth Proportional to 979.86, 1,352.80 and 587.02

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Solution

The fourth proportional to 979.86, 1,352.80 and 587.02 is: 810.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.86 : 1,352.80 = 587.02 : x
  2. Step 2: Convert to fraction form
    979.86/1,352.80 = 587.02/x
  3. Step 3: Cross multiply
    979.86x = 1,352.80 × 587.02
  4. Step 4: Simplify right side
    979.86x = 794,120.66
  5. Step 5: Solve for x
    x = 794,120.66/979.86
  6. Step 6: Final answer
    x = 810.44

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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.