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Finding the Fourth Proportional to 540, 808.11 and 430.65

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Solution

The fourth proportional to 540, 808.11 and 430.65 is: 644.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    540 : 808.11 = 430.65 : x
  2. Step 2: Convert to fraction form
    540/808.11 = 430.65/x
  3. Step 3: Cross multiply
    540x = 808.11 × 430.65
  4. Step 4: Simplify right side
    540x = 348,012.57
  5. Step 5: Solve for x
    x = 348,012.57/540
  6. Step 6: Final answer
    x = 644.47

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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.