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Finding the Fourth Proportional to 934.99, 1,400.89 and 660.55

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Solution

The fourth proportional to 934.99, 1,400.89 and 660.55 is: 989.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    934.99 : 1,400.89 = 660.55 : x
  2. Step 2: Convert to fraction form
    934.99/1,400.89 = 660.55/x
  3. Step 3: Cross multiply
    934.99x = 1,400.89 × 660.55
  4. Step 4: Simplify right side
    934.99x = 925,354.59
  5. Step 5: Solve for x
    x = 925,354.59/934.99
  6. Step 6: Final answer
    x = 989.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.