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Finding the Fourth Proportional to 1,261.84, 1,888.92 and 920.08

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Solution

The fourth proportional to 1,261.84, 1,888.92 and 920.08 is: 1,377.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.84 : 1,888.92 = 920.08 : x
  2. Step 2: Convert to fraction form
    1,261.84/1,888.92 = 920.08/x
  3. Step 3: Cross multiply
    1,261.84x = 1,888.92 × 920.08
  4. Step 4: Simplify right side
    1,261.84x = 1,737,957.51
  5. Step 5: Solve for x
    x = 1,737,957.51/1,261.84
  6. Step 6: Final answer
    x = 1,377.32

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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.