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Finding the Fourth Proportional to 924.80, 1,387.20 and 919.40

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Solution

The fourth proportional to 924.80, 1,387.20 and 919.40 is: 1,379.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    924.80 : 1,387.20 = 919.40 : x
  2. Step 2: Convert to fraction form
    924.80/1,387.20 = 919.40/x
  3. Step 3: Cross multiply
    924.80x = 1,387.20 × 919.40
  4. Step 4: Simplify right side
    924.80x = 1,275,391.68
  5. Step 5: Solve for x
    x = 1,275,391.68/924.80
  6. Step 6: Final answer
    x = 1,379.10

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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.