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Finding the Fourth Proportional to 1,452.68, 2,178.65 and 990.38

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Solution

The fourth proportional to 1,452.68, 2,178.65 and 990.38 is: 1,485.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,452.68 : 2,178.65 = 990.38 : x
  2. Step 2: Convert to fraction form
    1,452.68/2,178.65 = 990.38/x
  3. Step 3: Cross multiply
    1,452.68x = 2,178.65 × 990.38
  4. Step 4: Simplify right side
    1,452.68x = 2,157,681.48
  5. Step 5: Solve for x
    x = 2,157,681.48/1,452.68
  6. Step 6: Final answer
    x = 1,485.31

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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.