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Finding the Fourth Proportional to 435.13, 651.28 and 319.55

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Solution

The fourth proportional to 435.13, 651.28 and 319.55 is: 478.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    435.13 : 651.28 = 319.55 : x
  2. Step 2: Convert to fraction form
    435.13/651.28 = 319.55/x
  3. Step 3: Cross multiply
    435.13x = 651.28 × 319.55
  4. Step 4: Simplify right side
    435.13x = 208,115.37
  5. Step 5: Solve for x
    x = 208,115.37/435.13
  6. Step 6: Final answer
    x = 478.29

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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.