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Finding the Fourth Proportional to 907.38, 1,242.80 and 854.18

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Solution

The fourth proportional to 907.38, 1,242.80 and 854.18 is: 1,169.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.38 : 1,242.80 = 854.18 : x
  2. Step 2: Convert to fraction form
    907.38/1,242.80 = 854.18/x
  3. Step 3: Cross multiply
    907.38x = 1,242.80 × 854.18
  4. Step 4: Simplify right side
    907.38x = 1,061,564.42
  5. Step 5: Solve for x
    x = 1,061,564.42/907.38
  6. Step 6: Final answer
    x = 1,169.92

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.