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Finding the Fourth Proportional to 388.80, 583.04 and 206.16

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Solution

The fourth proportional to 388.80, 583.04 and 206.16 is: 309.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.80 : 583.04 = 206.16 : x
  2. Step 2: Convert to fraction form
    388.80/583.04 = 206.16/x
  3. Step 3: Cross multiply
    388.80x = 583.04 × 206.16
  4. Step 4: Simplify right side
    388.80x = 120,196.31
  5. Step 5: Solve for x
    x = 120,196.31/388.80
  6. Step 6: Final answer
    x = 309.14

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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.