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Finding the Fourth Proportional to 525.72, 787.56 and 386.65

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Solution

The fourth proportional to 525.72, 787.56 and 386.65 is: 579.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    525.72 : 787.56 = 386.65 : x
  2. Step 2: Convert to fraction form
    525.72/787.56 = 386.65/x
  3. Step 3: Cross multiply
    525.72x = 787.56 × 386.65
  4. Step 4: Simplify right side
    525.72x = 304,507.39
  5. Step 5: Solve for x
    x = 304,507.39/525.72
  6. Step 6: Final answer
    x = 579.22

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.