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Finding the Fourth Proportional to 1,614.90, 2,422.47 and 690.47

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Solution

The fourth proportional to 1,614.90, 2,422.47 and 690.47 is: 1,035.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,614.90 : 2,422.47 = 690.47 : x
  2. Step 2: Convert to fraction form
    1,614.90/2,422.47 = 690.47/x
  3. Step 3: Cross multiply
    1,614.90x = 2,422.47 × 690.47
  4. Step 4: Simplify right side
    1,614.90x = 1,672,630.75
  5. Step 5: Solve for x
    x = 1,672,630.75/1,614.90
  6. Step 6: Final answer
    x = 1,035.75

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1.5x scale

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.