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Finding the Fourth Proportional to 388.78, 583.40 and 145.29

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Solution

The fourth proportional to 388.78, 583.40 and 145.29 is: 218.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.78 : 583.40 = 145.29 : x
  2. Step 2: Convert to fraction form
    388.78/583.40 = 145.29/x
  3. Step 3: Cross multiply
    388.78x = 583.40 × 145.29
  4. Step 4: Simplify right side
    388.78x = 84,761.46
  5. Step 5: Solve for x
    x = 84,761.46/388.78
  6. Step 6: Final answer
    x = 218.02

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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.