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Finding the Fourth Proportional to 1,470.80, 2,205.64 and 430.46

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Solution

The fourth proportional to 1,470.80, 2,205.64 and 430.46 is: 645.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,470.80 : 2,205.64 = 430.46 : x
  2. Step 2: Convert to fraction form
    1,470.80/2,205.64 = 430.46/x
  3. Step 3: Cross multiply
    1,470.80x = 2,205.64 × 430.46
  4. Step 4: Simplify right side
    1,470.80x = 949,439.79
  5. Step 5: Solve for x
    x = 949,439.79/1,470.80
  6. Step 6: Final answer
    x = 645.53

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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.