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Finding the Fourth Proportional to 388.77, 536.67 and 284.61

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Solution

The fourth proportional to 388.77, 536.67 and 284.61 is: 392.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.77 : 536.67 = 284.61 : x
  2. Step 2: Convert to fraction form
    388.77/536.67 = 284.61/x
  3. Step 3: Cross multiply
    388.77x = 536.67 × 284.61
  4. Step 4: Simplify right side
    388.77x = 152,741.65
  5. Step 5: Solve for x
    x = 152,741.65/388.77
  6. Step 6: Final answer
    x = 392.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.