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Finding the Fourth Proportional to 678.79, 1,018.77 and 332.38

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Solution

The fourth proportional to 678.79, 1,018.77 and 332.38 is: 498.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.79 : 1,018.77 = 332.38 : x
  2. Step 2: Convert to fraction form
    678.79/1,018.77 = 332.38/x
  3. Step 3: Cross multiply
    678.79x = 1,018.77 × 332.38
  4. Step 4: Simplify right side
    678.79x = 338,618.77
  5. Step 5: Solve for x
    x = 338,618.77/678.79
  6. Step 6: Final answer
    x = 498.86

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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.