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Finding the Fourth Proportional to 836.69, 1,247.15 and 810.15

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Solution

The fourth proportional to 836.69, 1,247.15 and 810.15 is: 1,207.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    836.69 : 1,247.15 = 810.15 : x
  2. Step 2: Convert to fraction form
    836.69/1,247.15 = 810.15/x
  3. Step 3: Cross multiply
    836.69x = 1,247.15 × 810.15
  4. Step 4: Simplify right side
    836.69x = 1,010,374.52
  5. Step 5: Solve for x
    x = 1,010,374.52/836.69
  6. Step 6: Final answer
    x = 1,207.59

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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.