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Finding the Fourth Proportional to 388, 581.98 and 114.08

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Solution

The fourth proportional to 388, 581.98 and 114.08 is: 171.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    388 : 581.98 = 114.08 : x
  2. Step 2: Convert to fraction form
    388/581.98 = 114.08/x
  3. Step 3: Cross multiply
    388x = 581.98 × 114.08
  4. Step 4: Simplify right side
    388x = 66,392.28
  5. Step 5: Solve for x
    x = 66,392.28/388
  6. Step 6: Final answer
    x = 171.11

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.