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Finding the Fourth Proportional to 388.85, 536.87 and 315.32

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Solution

The fourth proportional to 388.85, 536.87 and 315.32 is: 435.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.85 : 536.87 = 315.32 : x
  2. Step 2: Convert to fraction form
    388.85/536.87 = 315.32/x
  3. Step 3: Cross multiply
    388.85x = 536.87 × 315.32
  4. Step 4: Simplify right side
    388.85x = 169,283.95
  5. Step 5: Solve for x
    x = 169,283.95/388.85
  6. Step 6: Final answer
    x = 435.35

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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.