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Finding the Fourth Proportional to 1,130.40, 1,694.16 and 872.64

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Solution

The fourth proportional to 1,130.40, 1,694.16 and 872.64 is: 1,307.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,130.40 : 1,694.16 = 872.64 : x
  2. Step 2: Convert to fraction form
    1,130.40/1,694.16 = 872.64/x
  3. Step 3: Cross multiply
    1,130.40x = 1,694.16 × 872.64
  4. Step 4: Simplify right side
    1,130.40x = 1,478,391.78
  5. Step 5: Solve for x
    x = 1,478,391.78/1,130.40
  6. Step 6: Final answer
    x = 1,307.85

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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.