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Finding the Fourth Proportional to 387.52, 530.08 and 386.30

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Solution

The fourth proportional to 387.52, 530.08 and 386.30 is: 528.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.52 : 530.08 = 386.30 : x
  2. Step 2: Convert to fraction form
    387.52/530.08 = 386.30/x
  3. Step 3: Cross multiply
    387.52x = 530.08 × 386.30
  4. Step 4: Simplify right side
    387.52x = 204,770.26
  5. Step 5: Solve for x
    x = 204,770.26/387.52
  6. Step 6: Final answer
    x = 528.42

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.