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Finding the Fourth Proportional to 912.45, 1,370.05 and 729.30

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Solution

The fourth proportional to 912.45, 1,370.05 and 729.30 is: 1,095.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.45 : 1,370.05 = 729.30 : x
  2. Step 2: Convert to fraction form
    912.45/1,370.05 = 729.30/x
  3. Step 3: Cross multiply
    912.45x = 1,370.05 × 729.30
  4. Step 4: Simplify right side
    912.45x = 999,177.47
  5. Step 5: Solve for x
    x = 999,177.47/912.45
  6. Step 6: Final answer
    x = 1,095.05

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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.