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Finding the Fourth Proportional to 388.51, 583.02 and 215.30

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Solution

The fourth proportional to 388.51, 583.02 and 215.30 is: 323.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.51 : 583.02 = 215.30 : x
  2. Step 2: Convert to fraction form
    388.51/583.02 = 215.30/x
  3. Step 3: Cross multiply
    388.51x = 583.02 × 215.30
  4. Step 4: Simplify right side
    388.51x = 125,523.13
  5. Step 5: Solve for x
    x = 125,523.13/388.51
  6. Step 6: Final answer
    x = 323.09

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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.