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Finding the Fourth Proportional to 1,145.84, 1,580.68 and 725.48

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Solution

The fourth proportional to 1,145.84, 1,580.68 and 725.48 is: 1,000.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.84 : 1,580.68 = 725.48 : x
  2. Step 2: Convert to fraction form
    1,145.84/1,580.68 = 725.48/x
  3. Step 3: Cross multiply
    1,145.84x = 1,580.68 × 725.48
  4. Step 4: Simplify right side
    1,145.84x = 1,146,751.73
  5. Step 5: Solve for x
    x = 1,146,751.73/1,145.84
  6. Step 6: Final answer
    x = 1,000.80

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1.5x scale

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.