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Finding the Fourth Proportional to 570.65, 856.26 and 388.17

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Solution

The fourth proportional to 570.65, 856.26 and 388.17 is: 582.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    570.65 : 856.26 = 388.17 : x
  2. Step 2: Convert to fraction form
    570.65/856.26 = 388.17/x
  3. Step 3: Cross multiply
    570.65x = 856.26 × 388.17
  4. Step 4: Simplify right side
    570.65x = 332,374.44
  5. Step 5: Solve for x
    x = 332,374.44/570.65
  6. Step 6: Final answer
    x = 582.45

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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.