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Finding the Fourth Proportional to 1,423.78, 2,134.92 and 644.02

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Solution

The fourth proportional to 1,423.78, 2,134.92 and 644.02 is: 965.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,423.78 : 2,134.92 = 644.02 : x
  2. Step 2: Convert to fraction form
    1,423.78/2,134.92 = 644.02/x
  3. Step 3: Cross multiply
    1,423.78x = 2,134.92 × 644.02
  4. Step 4: Simplify right side
    1,423.78x = 1,374,931.18
  5. Step 5: Solve for x
    x = 1,374,931.18/1,423.78
  6. Step 6: Final answer
    x = 965.69

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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.