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Finding the Fourth Proportional to 908, 1,253.76 and 790.40

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Solution

The fourth proportional to 908, 1,253.76 and 790.40 is: 1,091.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    908 : 1,253.76 = 790.40 : x
  2. Step 2: Convert to fraction form
    908/1,253.76 = 790.40/x
  3. Step 3: Cross multiply
    908x = 1,253.76 × 790.40
  4. Step 4: Simplify right side
    908x = 990,971.90
  5. Step 5: Solve for x
    x = 990,971.90/908
  6. Step 6: Final answer
    x = 1,091.38

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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.