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Finding the Fourth Proportional to 921.30, 1,373.20 and 851.07

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Solution

The fourth proportional to 921.30, 1,373.20 and 851.07 is: 1,268.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.30 : 1,373.20 = 851.07 : x
  2. Step 2: Convert to fraction form
    921.30/1,373.20 = 851.07/x
  3. Step 3: Cross multiply
    921.30x = 1,373.20 × 851.07
  4. Step 4: Simplify right side
    921.30x = 1,168,689.32
  5. Step 5: Solve for x
    x = 1,168,689.32/921.30
  6. Step 6: Final answer
    x = 1,268.52

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.