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Finding the Fourth Proportional to 570.84, 786.78 and 395.88

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Solution

The fourth proportional to 570.84, 786.78 and 395.88 is: 545.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    570.84 : 786.78 = 395.88 : x
  2. Step 2: Convert to fraction form
    570.84/786.78 = 395.88/x
  3. Step 3: Cross multiply
    570.84x = 786.78 × 395.88
  4. Step 4: Simplify right side
    570.84x = 311,470.47
  5. Step 5: Solve for x
    x = 311,470.47/570.84
  6. Step 6: Final answer
    x = 545.64

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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.