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Finding the Fourth Proportional to 838.63, 1,251.82 and 777.65

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Solution

The fourth proportional to 838.63, 1,251.82 and 777.65 is: 1,160.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.63 : 1,251.82 = 777.65 : x
  2. Step 2: Convert to fraction form
    838.63/1,251.82 = 777.65/x
  3. Step 3: Cross multiply
    838.63x = 1,251.82 × 777.65
  4. Step 4: Simplify right side
    838.63x = 973,470.51
  5. Step 5: Solve for x
    x = 973,470.51/838.63
  6. Step 6: Final answer
    x = 1,160.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.