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Finding the Fourth Proportional to 900.18, 1,242.45 and 605.70

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Solution

The fourth proportional to 900.18, 1,242.45 and 605.70 is: 836.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.18 : 1,242.45 = 605.70 : x
  2. Step 2: Convert to fraction form
    900.18/1,242.45 = 605.70/x
  3. Step 3: Cross multiply
    900.18x = 1,242.45 × 605.70
  4. Step 4: Simplify right side
    900.18x = 752,551.97
  5. Step 5: Solve for x
    x = 752,551.97/900.18
  6. Step 6: Final answer
    x = 836.00

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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.