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Finding the Fourth Proportional to 958.80, 1,340.70 and 958.80

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Solution

The fourth proportional to 958.80, 1,340.70 and 958.80 is: 1,340.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    958.80 : 1,340.70 = 958.80 : x
  2. Step 2: Convert to fraction form
    958.80/1,340.70 = 958.80/x
  3. Step 3: Cross multiply
    958.80x = 1,340.70 × 958.80
  4. Step 4: Simplify right side
    958.80x = 1,285,463.16
  5. Step 5: Solve for x
    x = 1,285,463.16/958.80
  6. Step 6: Final answer
    x = 1,340.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.