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Finding the Fourth Proportional to 1,115.94, 1,672.71 and 807.65

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Solution

The fourth proportional to 1,115.94, 1,672.71 and 807.65 is: 1,210.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.94 : 1,672.71 = 807.65 : x
  2. Step 2: Convert to fraction form
    1,115.94/1,672.71 = 807.65/x
  3. Step 3: Cross multiply
    1,115.94x = 1,672.71 × 807.65
  4. Step 4: Simplify right side
    1,115.94x = 1,350,955.87
  5. Step 5: Solve for x
    x = 1,350,955.87/1,115.94
  6. Step 6: Final answer
    x = 1,210.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.