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Finding the Fourth Proportional to 388.79, 583.13 and 145.26

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Solution

The fourth proportional to 388.79, 583.13 and 145.26 is: 217.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.79 : 583.13 = 145.26 : x
  2. Step 2: Convert to fraction form
    388.79/583.13 = 145.26/x
  3. Step 3: Cross multiply
    388.79x = 583.13 × 145.26
  4. Step 4: Simplify right side
    388.79x = 84,704.74
  5. Step 5: Solve for x
    x = 84,704.74/388.79
  6. Step 6: Final answer
    x = 217.87

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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.