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Finding the Fourth Proportional to 807.33, 1,112.79 and 715.05

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Solution

The fourth proportional to 807.33, 1,112.79 and 715.05 is: 985.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.33 : 1,112.79 = 715.05 : x
  2. Step 2: Convert to fraction form
    807.33/1,112.79 = 715.05/x
  3. Step 3: Cross multiply
    807.33x = 1,112.79 × 715.05
  4. Step 4: Simplify right side
    807.33x = 795,700.49
  5. Step 5: Solve for x
    x = 795,700.49/807.33
  6. Step 6: Final answer
    x = 985.60

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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.