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Finding the Fourth Proportional to 1,200.80, 1,657.02 and 669.61

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Solution

The fourth proportional to 1,200.80, 1,657.02 and 669.61 is: 924.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,200.80 : 1,657.02 = 669.61 : x
  2. Step 2: Convert to fraction form
    1,200.80/1,657.02 = 669.61/x
  3. Step 3: Cross multiply
    1,200.80x = 1,657.02 × 669.61
  4. Step 4: Simplify right side
    1,200.80x = 1,109,548.88
  5. Step 5: Solve for x
    x = 1,109,548.88/1,200.80
  6. Step 6: Final answer
    x = 924.01

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.