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Finding the Fourth Proportional to 387.60, 535.61 and 282.51

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Solution

The fourth proportional to 387.60, 535.61 and 282.51 is: 390.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.60 : 535.61 = 282.51 : x
  2. Step 2: Convert to fraction form
    387.60/535.61 = 282.51/x
  3. Step 3: Cross multiply
    387.60x = 535.61 × 282.51
  4. Step 4: Simplify right side
    387.60x = 151,315.80
  5. Step 5: Solve for x
    x = 151,315.80/387.60
  6. Step 6: Final answer
    x = 390.39

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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.