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Finding the Fourth Proportional to 900.18, 1,240.44 and 787.56

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Solution

The fourth proportional to 900.18, 1,240.44 and 787.56 is: 1,085.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.18 : 1,240.44 = 787.56 : x
  2. Step 2: Convert to fraction form
    900.18/1,240.44 = 787.56/x
  3. Step 3: Cross multiply
    900.18x = 1,240.44 × 787.56
  4. Step 4: Simplify right side
    900.18x = 976,920.93
  5. Step 5: Solve for x
    x = 976,920.93/900.18
  6. Step 6: Final answer
    x = 1,085.25

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.