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Finding the Fourth Proportional to 389.92, 583.80 and 253.12

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Solution

The fourth proportional to 389.92, 583.80 and 253.12 is: 378.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.92 : 583.80 = 253.12 : x
  2. Step 2: Convert to fraction form
    389.92/583.80 = 253.12/x
  3. Step 3: Cross multiply
    389.92x = 583.80 × 253.12
  4. Step 4: Simplify right side
    389.92x = 147,771.46
  5. Step 5: Solve for x
    x = 147,771.46/389.92
  6. Step 6: Final answer
    x = 378.98

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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.