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Finding the Fourth Proportional to 291.95, 435.78 and 253.70

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Solution

The fourth proportional to 291.95, 435.78 and 253.70 is: 378.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.95 : 435.78 = 253.70 : x
  2. Step 2: Convert to fraction form
    291.95/435.78 = 253.70/x
  3. Step 3: Cross multiply
    291.95x = 435.78 × 253.70
  4. Step 4: Simplify right side
    291.95x = 110,557.39
  5. Step 5: Solve for x
    x = 110,557.39/291.95
  6. Step 6: Final answer
    x = 378.69

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.