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Finding the Fourth Proportional to 921.96, 1,381.80 and 536.40

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Solution

The fourth proportional to 921.96, 1,381.80 and 536.40 is: 803.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.96 : 1,381.80 = 536.40 : x
  2. Step 2: Convert to fraction form
    921.96/1,381.80 = 536.40/x
  3. Step 3: Cross multiply
    921.96x = 1,381.80 × 536.40
  4. Step 4: Simplify right side
    921.96x = 741,197.52
  5. Step 5: Solve for x
    x = 741,197.52/921.96
  6. Step 6: Final answer
    x = 803.94

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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.