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Finding the Fourth Proportional to 1,661.70, 2,487.28 and 929.05

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Solution

The fourth proportional to 1,661.70, 2,487.28 and 929.05 is: 1,390.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,661.70 : 2,487.28 = 929.05 : x
  2. Step 2: Convert to fraction form
    1,661.70/2,487.28 = 929.05/x
  3. Step 3: Cross multiply
    1,661.70x = 2,487.28 × 929.05
  4. Step 4: Simplify right side
    1,661.70x = 2,310,805.16
  5. Step 5: Solve for x
    x = 2,310,805.16/1,661.70
  6. Step 6: Final answer
    x = 1,390.63

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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.