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Finding the Fourth Proportional to 570.30, 786.33 and 395.70

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Solution

The fourth proportional to 570.30, 786.33 and 395.70 is: 545.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    570.30 : 786.33 = 395.70 : x
  2. Step 2: Convert to fraction form
    570.30/786.33 = 395.70/x
  3. Step 3: Cross multiply
    570.30x = 786.33 × 395.70
  4. Step 4: Simplify right side
    570.30x = 311,150.78
  5. Step 5: Solve for x
    x = 311,150.78/570.30
  6. Step 6: Final answer
    x = 545.59

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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.