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Finding the Fourth Proportional to 679.84, 937.90 and 417.40

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Solution

The fourth proportional to 679.84, 937.90 and 417.40 is: 575.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.84 : 937.90 = 417.40 : x
  2. Step 2: Convert to fraction form
    679.84/937.90 = 417.40/x
  3. Step 3: Cross multiply
    679.84x = 937.90 × 417.40
  4. Step 4: Simplify right side
    679.84x = 391,479.46
  5. Step 5: Solve for x
    x = 391,479.46/679.84
  6. Step 6: Final answer
    x = 575.84

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.