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Finding the Fourth Proportional to 388.87, 536.47 and 283.70

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Solution

The fourth proportional to 388.87, 536.47 and 283.70 is: 391.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.87 : 536.47 = 283.70 : x
  2. Step 2: Convert to fraction form
    388.87/536.47 = 283.70/x
  3. Step 3: Cross multiply
    388.87x = 536.47 × 283.70
  4. Step 4: Simplify right side
    388.87x = 152,197.17
  5. Step 5: Solve for x
    x = 152,197.17/388.87
  6. Step 6: Final answer
    x = 391.39

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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.