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Finding the Fourth Proportional to 1,250.64, 1,725.36 and 784.80

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Solution

The fourth proportional to 1,250.64, 1,725.36 and 784.80 is: 1,082.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,250.64 : 1,725.36 = 784.80 : x
  2. Step 2: Convert to fraction form
    1,250.64/1,725.36 = 784.80/x
  3. Step 3: Cross multiply
    1,250.64x = 1,725.36 × 784.80
  4. Step 4: Simplify right side
    1,250.64x = 1,354,062.53
  5. Step 5: Solve for x
    x = 1,354,062.53/1,250.64
  6. Step 6: Final answer
    x = 1,082.70

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.