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Finding the Fourth Proportional to 988.78, 1,478.84 and 807.34

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Solution

The fourth proportional to 988.78, 1,478.84 and 807.34 is: 1,207.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.78 : 1,478.84 = 807.34 : x
  2. Step 2: Convert to fraction form
    988.78/1,478.84 = 807.34/x
  3. Step 3: Cross multiply
    988.78x = 1,478.84 × 807.34
  4. Step 4: Simplify right side
    988.78x = 1,193,926.69
  5. Step 5: Solve for x
    x = 1,193,926.69/988.78
  6. Step 6: Final answer
    x = 1,207.47

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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.