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Finding the Fourth Proportional to 1,288.61, 1,931.54 and 548.61

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Solution

The fourth proportional to 1,288.61, 1,931.54 and 548.61 is: 822.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288.61 : 1,931.54 = 548.61 : x
  2. Step 2: Convert to fraction form
    1,288.61/1,931.54 = 548.61/x
  3. Step 3: Cross multiply
    1,288.61x = 1,931.54 × 548.61
  4. Step 4: Simplify right side
    1,288.61x = 1,059,659.42
  5. Step 5: Solve for x
    x = 1,059,659.42/1,288.61
  6. Step 6: Final answer
    x = 822.33

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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.