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Finding the Fourth Proportional to 570.85, 786.85 and 384.28

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Solution

The fourth proportional to 570.85, 786.85 and 384.28 is: 529.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    570.85 : 786.85 = 384.28 : x
  2. Step 2: Convert to fraction form
    570.85/786.85 = 384.28/x
  3. Step 3: Cross multiply
    570.85x = 786.85 × 384.28
  4. Step 4: Simplify right side
    570.85x = 302,367.79
  5. Step 5: Solve for x
    x = 302,367.79/570.85
  6. Step 6: Final answer
    x = 529.68

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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.