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Finding the Fourth Proportional to 679.84, 1,018.40 and 623.84

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Solution

The fourth proportional to 679.84, 1,018.40 and 623.84 is: 934.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.84 : 1,018.40 = 623.84 : x
  2. Step 2: Convert to fraction form
    679.84/1,018.40 = 623.84/x
  3. Step 3: Cross multiply
    679.84x = 1,018.40 × 623.84
  4. Step 4: Simplify right side
    679.84x = 635,318.66
  5. Step 5: Solve for x
    x = 635,318.66/679.84
  6. Step 6: Final answer
    x = 934.51

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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.