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Finding the Fourth Proportional to 711.60, 979.74 and 675.18

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Solution

The fourth proportional to 711.60, 979.74 and 675.18 is: 929.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.60 : 979.74 = 675.18 : x
  2. Step 2: Convert to fraction form
    711.60/979.74 = 675.18/x
  3. Step 3: Cross multiply
    711.60x = 979.74 × 675.18
  4. Step 4: Simplify right side
    711.60x = 661,500.85
  5. Step 5: Solve for x
    x = 661,500.85/711.60
  6. Step 6: Final answer
    x = 929.60

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1.5x scale

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.