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Finding the Fourth Proportional to 559.45, 838.45 and 430.57

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Solution

The fourth proportional to 559.45, 838.45 and 430.57 is: 645.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    559.45 : 838.45 = 430.57 : x
  2. Step 2: Convert to fraction form
    559.45/838.45 = 430.57/x
  3. Step 3: Cross multiply
    559.45x = 838.45 × 430.57
  4. Step 4: Simplify right side
    559.45x = 361,011.42
  5. Step 5: Solve for x
    x = 361,011.42/559.45
  6. Step 6: Final answer
    x = 645.30

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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.