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Finding the Fourth Proportional to 1,307.74, 1,959.78 and 982.90

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Solution

The fourth proportional to 1,307.74, 1,959.78 and 982.90 is: 1,472.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,307.74 : 1,959.78 = 982.90 : x
  2. Step 2: Convert to fraction form
    1,307.74/1,959.78 = 982.90/x
  3. Step 3: Cross multiply
    1,307.74x = 1,959.78 × 982.90
  4. Step 4: Simplify right side
    1,307.74x = 1,926,267.76
  5. Step 5: Solve for x
    x = 1,926,267.76/1,307.74
  6. Step 6: Final answer
    x = 1,472.97

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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.