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Finding the Fourth Proportional to 389.32, 583.88 and 142.47

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Solution

The fourth proportional to 389.32, 583.88 and 142.47 is: 213.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.32 : 583.88 = 142.47 : x
  2. Step 2: Convert to fraction form
    389.32/583.88 = 142.47/x
  3. Step 3: Cross multiply
    389.32x = 583.88 × 142.47
  4. Step 4: Simplify right side
    389.32x = 83,184.67
  5. Step 5: Solve for x
    x = 83,184.67/389.32
  6. Step 6: Final answer
    x = 213.67

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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.