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Finding the Fourth Proportional to 439.88, 607.28 and 290.51

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Solution

The fourth proportional to 439.88, 607.28 and 290.51 is: 401.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.88 : 607.28 = 290.51 : x
  2. Step 2: Convert to fraction form
    439.88/607.28 = 290.51/x
  3. Step 3: Cross multiply
    439.88x = 607.28 × 290.51
  4. Step 4: Simplify right side
    439.88x = 176,417.88
  5. Step 5: Solve for x
    x = 176,417.88/439.88
  6. Step 6: Final answer
    x = 401.06

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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.