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Finding the Fourth Proportional to 1,145.52, 1,719.36 and 985.68

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Solution

The fourth proportional to 1,145.52, 1,719.36 and 985.68 is: 1,479.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.52 : 1,719.36 = 985.68 : x
  2. Step 2: Convert to fraction form
    1,145.52/1,719.36 = 985.68/x
  3. Step 3: Cross multiply
    1,145.52x = 1,719.36 × 985.68
  4. Step 4: Simplify right side
    1,145.52x = 1,694,738.76
  5. Step 5: Solve for x
    x = 1,694,738.76/1,145.52
  6. Step 6: Final answer
    x = 1,479.45

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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.