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Finding the Fourth Proportional to 1,201.07, 1,657.36 and 669.90

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Solution

The fourth proportional to 1,201.07, 1,657.36 and 669.90 is: 924.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,201.07 : 1,657.36 = 669.90 : x
  2. Step 2: Convert to fraction form
    1,201.07/1,657.36 = 669.90/x
  3. Step 3: Cross multiply
    1,201.07x = 1,657.36 × 669.90
  4. Step 4: Simplify right side
    1,201.07x = 1,110,265.46
  5. Step 5: Solve for x
    x = 1,110,265.46/1,201.07
  6. Step 6: Final answer
    x = 924.40

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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.