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Finding the Fourth Proportional to 388.87, 536.57 and 315.06

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Solution

The fourth proportional to 388.87, 536.57 and 315.06 is: 434.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.87 : 536.57 = 315.06 : x
  2. Step 2: Convert to fraction form
    388.87/536.57 = 315.06/x
  3. Step 3: Cross multiply
    388.87x = 536.57 × 315.06
  4. Step 4: Simplify right side
    388.87x = 169,047.49
  5. Step 5: Solve for x
    x = 169,047.49/388.87
  6. Step 6: Final answer
    x = 434.72

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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.