Home / 1,087.78-1,631.66-307.79

Finding the Fourth Proportional to 1,087.78, 1,631.66 and 307.79

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Solution

The fourth proportional to 1,087.78, 1,631.66 and 307.79 is: 461.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,087.78 : 1,631.66 = 307.79 : x
  2. Step 2: Convert to fraction form
    1,087.78/1,631.66 = 307.79/x
  3. Step 3: Cross multiply
    1,087.78x = 1,631.66 × 307.79
  4. Step 4: Simplify right side
    1,087.78x = 502,200.47
  5. Step 5: Solve for x
    x = 502,200.47/1,087.78
  6. Step 6: Final answer
    x = 461.68

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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.