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Finding the Fourth Proportional to 525.12, 787.92 and 390

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Solution

The fourth proportional to 525.12, 787.92 and 390 is: 585.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    525.12 : 787.92 = 390 : x
  2. Step 2: Convert to fraction form
    525.12/787.92 = 390/x
  3. Step 3: Cross multiply
    525.12x = 787.92 × 390
  4. Step 4: Simplify right side
    525.12x = 307,288.80
  5. Step 5: Solve for x
    x = 307,288.80/525.12
  6. Step 6: Final answer
    x = 585.18

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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.