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Finding the Fourth Proportional to 1,146.65, 1,719.39 and 406.15

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Solution

The fourth proportional to 1,146.65, 1,719.39 and 406.15 is: 609.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,146.65 : 1,719.39 = 406.15 : x
  2. Step 2: Convert to fraction form
    1,146.65/1,719.39 = 406.15/x
  3. Step 3: Cross multiply
    1,146.65x = 1,719.39 × 406.15
  4. Step 4: Simplify right side
    1,146.65x = 698,327.47
  5. Step 5: Solve for x
    x = 698,327.47/1,146.65
  6. Step 6: Final answer
    x = 609.02

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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.