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Finding the Fourth Proportional to 807.67, 1,210.76 and 287.31

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Solution

The fourth proportional to 807.67, 1,210.76 and 287.31 is: 430.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.67 : 1,210.76 = 287.31 : x
  2. Step 2: Convert to fraction form
    807.67/1,210.76 = 287.31/x
  3. Step 3: Cross multiply
    807.67x = 1,210.76 × 287.31
  4. Step 4: Simplify right side
    807.67x = 347,862.02
  5. Step 5: Solve for x
    x = 347,862.02/807.67
  6. Step 6: Final answer
    x = 430.70

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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.