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Finding the Fourth Proportional to 1,113.72, 1,669.04 and 921.04

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Solution

The fourth proportional to 1,113.72, 1,669.04 and 921.04 is: 1,380.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,113.72 : 1,669.04 = 921.04 : x
  2. Step 2: Convert to fraction form
    1,113.72/1,669.04 = 921.04/x
  3. Step 3: Cross multiply
    1,113.72x = 1,669.04 × 921.04
  4. Step 4: Simplify right side
    1,113.72x = 1,537,248.00
  5. Step 5: Solve for x
    x = 1,537,248.00/1,113.72
  6. Step 6: Final answer
    x = 1,380.28

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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.