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Finding the Fourth Proportional to 407.31, 561.51 and 290.67

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Solution

The fourth proportional to 407.31, 561.51 and 290.67 is: 400.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.31 : 561.51 = 290.67 : x
  2. Step 2: Convert to fraction form
    407.31/561.51 = 290.67/x
  3. Step 3: Cross multiply
    407.31x = 561.51 × 290.67
  4. Step 4: Simplify right side
    407.31x = 163,215.13
  5. Step 5: Solve for x
    x = 163,215.13/407.31
  6. Step 6: Final answer
    x = 400.71

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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.