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Finding the Fourth Proportional to 570.75, 787.85 and 421.11

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Solution

The fourth proportional to 570.75, 787.85 and 421.11 is: 581.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    570.75 : 787.85 = 421.11 : x
  2. Step 2: Convert to fraction form
    570.75/787.85 = 421.11/x
  3. Step 3: Cross multiply
    570.75x = 787.85 × 421.11
  4. Step 4: Simplify right side
    570.75x = 331,773.28
  5. Step 5: Solve for x
    x = 331,773.28/570.75
  6. Step 6: Final answer
    x = 581.30

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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.