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Finding the Fourth Proportional to 1,332.60, 2,000.16 and 639.63

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Solution

The fourth proportional to 1,332.60, 2,000.16 and 639.63 is: 960.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,332.60 : 2,000.16 = 639.63 : x
  2. Step 2: Convert to fraction form
    1,332.60/2,000.16 = 639.63/x
  3. Step 3: Cross multiply
    1,332.60x = 2,000.16 × 639.63
  4. Step 4: Simplify right side
    1,332.60x = 1,279,362.34
  5. Step 5: Solve for x
    x = 1,279,362.34/1,332.60
  6. Step 6: Final answer
    x = 960.05

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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.