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Finding the Fourth Proportional to 1,147.15, 1,718.89 and 872.40

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Solution

The fourth proportional to 1,147.15, 1,718.89 and 872.40 is: 1,307.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,147.15 : 1,718.89 = 872.40 : x
  2. Step 2: Convert to fraction form
    1,147.15/1,718.89 = 872.40/x
  3. Step 3: Cross multiply
    1,147.15x = 1,718.89 × 872.40
  4. Step 4: Simplify right side
    1,147.15x = 1,499,559.64
  5. Step 5: Solve for x
    x = 1,499,559.64/1,147.15
  6. Step 6: Final answer
    x = 1,307.20

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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.