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Finding the Fourth Proportional to 388.63, 536.61 and 342.55

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Solution

The fourth proportional to 388.63, 536.61 and 342.55 is: 472.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.63 : 536.61 = 342.55 : x
  2. Step 2: Convert to fraction form
    388.63/536.61 = 342.55/x
  3. Step 3: Cross multiply
    388.63x = 536.61 × 342.55
  4. Step 4: Simplify right side
    388.63x = 183,815.76
  5. Step 5: Solve for x
    x = 183,815.76/388.63
  6. Step 6: Final answer
    x = 472.98

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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.