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Finding the Fourth Proportional to 1,079.66, 1,620.30 and 430.04

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Solution

The fourth proportional to 1,079.66, 1,620.30 and 430.04 is: 645.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.66 : 1,620.30 = 430.04 : x
  2. Step 2: Convert to fraction form
    1,079.66/1,620.30 = 430.04/x
  3. Step 3: Cross multiply
    1,079.66x = 1,620.30 × 430.04
  4. Step 4: Simplify right side
    1,079.66x = 696,793.81
  5. Step 5: Solve for x
    x = 696,793.81/1,079.66
  6. Step 6: Final answer
    x = 645.38

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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.