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Finding the Fourth Proportional to 570.76, 787.64 and 308.78

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Solution

The fourth proportional to 570.76, 787.64 and 308.78 is: 426.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    570.76 : 787.64 = 308.78 : x
  2. Step 2: Convert to fraction form
    570.76/787.64 = 308.78/x
  3. Step 3: Cross multiply
    570.76x = 787.64 × 308.78
  4. Step 4: Simplify right side
    570.76x = 243,204.31
  5. Step 5: Solve for x
    x = 243,204.31/570.76
  6. Step 6: Final answer
    x = 426.11

Related Problems

Find fourth proportional to 285.38, 393.82 and 154.39
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Double scale
Find fourth proportional to 571.76, 789.02 and 309.78
Similar ratio
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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.