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Finding the Fourth Proportional to 979.30, 1,470.15 and 540.90

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Solution

The fourth proportional to 979.30, 1,470.15 and 540.90 is: 812.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.30 : 1,470.15 = 540.90 : x
  2. Step 2: Convert to fraction form
    979.30/1,470.15 = 540.90/x
  3. Step 3: Cross multiply
    979.30x = 1,470.15 × 540.90
  4. Step 4: Simplify right side
    979.30x = 795,204.14
  5. Step 5: Solve for x
    x = 795,204.14/979.30
  6. Step 6: Final answer
    x = 812.01

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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.