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Finding the Fourth Proportional to 929.76, 1,391.88 and 684.60

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Solution

The fourth proportional to 929.76, 1,391.88 and 684.60 is: 1,024.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.76 : 1,391.88 = 684.60 : x
  2. Step 2: Convert to fraction form
    929.76/1,391.88 = 684.60/x
  3. Step 3: Cross multiply
    929.76x = 1,391.88 × 684.60
  4. Step 4: Simplify right side
    929.76x = 952,881.05
  5. Step 5: Solve for x
    x = 952,881.05/929.76
  6. Step 6: Final answer
    x = 1,024.87

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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.