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Finding the Fourth Proportional to 388.94, 583.51 and 115.04

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Solution

The fourth proportional to 388.94, 583.51 and 115.04 is: 172.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.94 : 583.51 = 115.04 : x
  2. Step 2: Convert to fraction form
    388.94/583.51 = 115.04/x
  3. Step 3: Cross multiply
    388.94x = 583.51 × 115.04
  4. Step 4: Simplify right side
    388.94x = 67,128.59
  5. Step 5: Solve for x
    x = 67,128.59/388.94
  6. Step 6: Final answer
    x = 172.59

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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.