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Finding the Fourth Proportional to 678.59, 1,018.04 and 210.11

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Solution

The fourth proportional to 678.59, 1,018.04 and 210.11 is: 315.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.59 : 1,018.04 = 210.11 : x
  2. Step 2: Convert to fraction form
    678.59/1,018.04 = 210.11/x
  3. Step 3: Cross multiply
    678.59x = 1,018.04 × 210.11
  4. Step 4: Simplify right side
    678.59x = 213,900.38
  5. Step 5: Solve for x
    x = 213,900.38/678.59
  6. Step 6: Final answer
    x = 315.21

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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.