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Finding the Fourth Proportional to 922.92, 1,386.54 and 851.64

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Solution

The fourth proportional to 922.92, 1,386.54 and 851.64 is: 1,279.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    922.92 : 1,386.54 = 851.64 : x
  2. Step 2: Convert to fraction form
    922.92/1,386.54 = 851.64/x
  3. Step 3: Cross multiply
    922.92x = 1,386.54 × 851.64
  4. Step 4: Simplify right side
    922.92x = 1,180,832.93
  5. Step 5: Solve for x
    x = 1,180,832.93/922.92
  6. Step 6: Final answer
    x = 1,279.45

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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.