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Finding the Fourth Proportional to 900.15, 1,348.95 and 669.90

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Solution

The fourth proportional to 900.15, 1,348.95 and 669.90 is: 1,003.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.15 : 1,348.95 = 669.90 : x
  2. Step 2: Convert to fraction form
    900.15/1,348.95 = 669.90/x
  3. Step 3: Cross multiply
    900.15x = 1,348.95 × 669.90
  4. Step 4: Simplify right side
    900.15x = 903,661.61
  5. Step 5: Solve for x
    x = 903,661.61/900.15
  6. Step 6: Final answer
    x = 1,003.90

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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.