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Finding the Fourth Proportional to 3,470.80, 5,202.80 and 1,390.24

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Solution

The fourth proportional to 3,470.80, 5,202.80 and 1,390.24 is: 2,084.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,470.80 : 5,202.80 = 1,390.24 : x
  2. Step 2: Convert to fraction form
    3,470.80/5,202.80 = 1,390.24/x
  3. Step 3: Cross multiply
    3,470.80x = 5,202.80 × 1,390.24
  4. Step 4: Simplify right side
    3,470.80x = 7,233,140.67
  5. Step 5: Solve for x
    x = 7,233,140.67/3,470.80
  6. Step 6: Final answer
    x = 2,084.00

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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.