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Finding the Fourth Proportional to 2,838.30, 4,254.54 and 987.90

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Solution

The fourth proportional to 2,838.30, 4,254.54 and 987.90 is: 1,480.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,838.30 : 4,254.54 = 987.90 : x
  2. Step 2: Convert to fraction form
    2,838.30/4,254.54 = 987.90/x
  3. Step 3: Cross multiply
    2,838.30x = 4,254.54 × 987.90
  4. Step 4: Simplify right side
    2,838.30x = 4,203,060.07
  5. Step 5: Solve for x
    x = 4,203,060.07/2,838.30
  6. Step 6: Final answer
    x = 1,480.84

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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.