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Finding the Fourth Proportional to 570.38, 787.12 and 308.39

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Solution

The fourth proportional to 570.38, 787.12 and 308.39 is: 425.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    570.38 : 787.12 = 308.39 : x
  2. Step 2: Convert to fraction form
    570.38/787.12 = 308.39/x
  3. Step 3: Cross multiply
    570.38x = 787.12 × 308.39
  4. Step 4: Simplify right side
    570.38x = 242,741.13
  5. Step 5: Solve for x
    x = 242,741.13/570.38
  6. Step 6: Final answer
    x = 425.58

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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.