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Finding the Fourth Proportional to 570.81, 787.71 and 308.82

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Solution

The fourth proportional to 570.81, 787.71 and 308.82 is: 426.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    570.81 : 787.71 = 308.82 : x
  2. Step 2: Convert to fraction form
    570.81/787.71 = 308.82/x
  3. Step 3: Cross multiply
    570.81x = 787.71 × 308.82
  4. Step 4: Simplify right side
    570.81x = 243,259.44
  5. Step 5: Solve for x
    x = 243,259.44/570.81
  6. Step 6: Final answer
    x = 426.17

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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.