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Finding the Fourth Proportional to 900.15, 1,340.92 and 872.95

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Solution

The fourth proportional to 900.15, 1,340.92 and 872.95 is: 1,300.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.15 : 1,340.92 = 872.95 : x
  2. Step 2: Convert to fraction form
    900.15/1,340.92 = 872.95/x
  3. Step 3: Cross multiply
    900.15x = 1,340.92 × 872.95
  4. Step 4: Simplify right side
    900.15x = 1,170,545.04
  5. Step 5: Solve for x
    x = 1,170,545.04/900.15
  6. Step 6: Final answer
    x = 1,300.40

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.