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Finding the Fourth Proportional to 942.38, 1,302.11 and 909.12

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Solution

The fourth proportional to 942.38, 1,302.11 and 909.12 is: 1,256.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    942.38 : 1,302.11 = 909.12 : x
  2. Step 2: Convert to fraction form
    942.38/1,302.11 = 909.12/x
  3. Step 3: Cross multiply
    942.38x = 1,302.11 × 909.12
  4. Step 4: Simplify right side
    942.38x = 1,183,777.99
  5. Step 5: Solve for x
    x = 1,183,777.99/942.38
  6. Step 6: Final answer
    x = 1,256.15

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1.5x scale

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.