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Finding the Fourth Proportional to 679.78, 937.74 and 430.67

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Solution

The fourth proportional to 679.78, 937.74 and 430.67 is: 594.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.78 : 937.74 = 430.67 : x
  2. Step 2: Convert to fraction form
    679.78/937.74 = 430.67/x
  3. Step 3: Cross multiply
    679.78x = 937.74 × 430.67
  4. Step 4: Simplify right side
    679.78x = 403,856.49
  5. Step 5: Solve for x
    x = 403,856.49/679.78
  6. Step 6: Final answer
    x = 594.10

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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.