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Finding the Fourth Proportional to 807.50, 1,208.10 and 688.88

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Solution

The fourth proportional to 807.50, 1,208.10 and 688.88 is: 1,030.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.50 : 1,208.10 = 688.88 : x
  2. Step 2: Convert to fraction form
    807.50/1,208.10 = 688.88/x
  3. Step 3: Cross multiply
    807.50x = 1,208.10 × 688.88
  4. Step 4: Simplify right side
    807.50x = 832,235.93
  5. Step 5: Solve for x
    x = 832,235.93/807.50
  6. Step 6: Final answer
    x = 1,030.63

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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.