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Finding the Fourth Proportional to 1,423.52, 2,133.45 and 643.49

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Solution

The fourth proportional to 1,423.52, 2,133.45 and 643.49 is: 964.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,423.52 : 2,133.45 = 643.49 : x
  2. Step 2: Convert to fraction form
    1,423.52/2,133.45 = 643.49/x
  3. Step 3: Cross multiply
    1,423.52x = 2,133.45 × 643.49
  4. Step 4: Simplify right side
    1,423.52x = 1,372,853.74
  5. Step 5: Solve for x
    x = 1,372,853.74/1,423.52
  6. Step 6: Final answer
    x = 964.41

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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.