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Finding the Fourth Proportional to 391, 539.70 and 253

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Solution

The fourth proportional to 391, 539.70 and 253 is: 349.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    391 : 539.70 = 253 : x
  2. Step 2: Convert to fraction form
    391/539.70 = 253/x
  3. Step 3: Cross multiply
    391x = 539.70 × 253
  4. Step 4: Simplify right side
    391x = 136,544.10
  5. Step 5: Solve for x
    x = 136,544.10/391
  6. Step 6: Final answer
    x = 349.22

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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.