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Finding the Fourth Proportional to 979.68, 1,352.10 and 586.74

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Solution

The fourth proportional to 979.68, 1,352.10 and 586.74 is: 809.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.68 : 1,352.10 = 586.74 : x
  2. Step 2: Convert to fraction form
    979.68/1,352.10 = 586.74/x
  3. Step 3: Cross multiply
    979.68x = 1,352.10 × 586.74
  4. Step 4: Simplify right side
    979.68x = 793,331.15
  5. Step 5: Solve for x
    x = 793,331.15/979.68
  6. Step 6: Final answer
    x = 809.79

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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.