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Finding the Fourth Proportional to 383.78, 530.15 and 342.32

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Solution

The fourth proportional to 383.78, 530.15 and 342.32 is: 472.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    383.78 : 530.15 = 342.32 : x
  2. Step 2: Convert to fraction form
    383.78/530.15 = 342.32/x
  3. Step 3: Cross multiply
    383.78x = 530.15 × 342.32
  4. Step 4: Simplify right side
    383.78x = 181,476.59
  5. Step 5: Solve for x
    x = 181,476.59/383.78
  6. Step 6: Final answer
    x = 472.87

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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.