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Finding the Fourth Proportional to 1,095.28, 1,641.30 and 478.42

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Solution

The fourth proportional to 1,095.28, 1,641.30 and 478.42 is: 716.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,095.28 : 1,641.30 = 478.42 : x
  2. Step 2: Convert to fraction form
    1,095.28/1,641.30 = 478.42/x
  3. Step 3: Cross multiply
    1,095.28x = 1,641.30 × 478.42
  4. Step 4: Simplify right side
    1,095.28x = 785,230.75
  5. Step 5: Solve for x
    x = 785,230.75/1,095.28
  6. Step 6: Final answer
    x = 716.92

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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.