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Finding the Fourth Proportional to 1,333.68, 1,999.53 and 921.64

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Solution

The fourth proportional to 1,333.68, 1,999.53 and 921.64 is: 1,381.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,333.68 : 1,999.53 = 921.64 : x
  2. Step 2: Convert to fraction form
    1,333.68/1,999.53 = 921.64/x
  3. Step 3: Cross multiply
    1,333.68x = 1,999.53 × 921.64
  4. Step 4: Simplify right side
    1,333.68x = 1,842,846.83
  5. Step 5: Solve for x
    x = 1,842,846.83/1,333.68
  6. Step 6: Final answer
    x = 1,381.78

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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.