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Finding the Fourth Proportional to 921.03, 1,380.10 and 783.51

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Solution

The fourth proportional to 921.03, 1,380.10 and 783.51 is: 1,174.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.03 : 1,380.10 = 783.51 : x
  2. Step 2: Convert to fraction form
    921.03/1,380.10 = 783.51/x
  3. Step 3: Cross multiply
    921.03x = 1,380.10 × 783.51
  4. Step 4: Simplify right side
    921.03x = 1,081,322.15
  5. Step 5: Solve for x
    x = 1,081,322.15/921.03
  6. Step 6: Final answer
    x = 1,174.04

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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.