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Finding the Fourth Proportional to 810.65, 1,118.27 and 613.82

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Solution

The fourth proportional to 810.65, 1,118.27 and 613.82 is: 846.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.65 : 1,118.27 = 613.82 : x
  2. Step 2: Convert to fraction form
    810.65/1,118.27 = 613.82/x
  3. Step 3: Cross multiply
    810.65x = 1,118.27 × 613.82
  4. Step 4: Simplify right side
    810.65x = 686,416.49
  5. Step 5: Solve for x
    x = 686,416.49/810.65
  6. Step 6: Final answer
    x = 846.75

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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.