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Finding the Fourth Proportional to 401.58, 554.20 and 259.74

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Solution

The fourth proportional to 401.58, 554.20 and 259.74 is: 358.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.58 : 554.20 = 259.74 : x
  2. Step 2: Convert to fraction form
    401.58/554.20 = 259.74/x
  3. Step 3: Cross multiply
    401.58x = 554.20 × 259.74
  4. Step 4: Simplify right side
    401.58x = 143,947.91
  5. Step 5: Solve for x
    x = 143,947.91/401.58
  6. Step 6: Final answer
    x = 358.45

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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.