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Finding the Fourth Proportional to 430.97, 648.27 and 390.87

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Solution

The fourth proportional to 430.97, 648.27 and 390.87 is: 587.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.97 : 648.27 = 390.87 : x
  2. Step 2: Convert to fraction form
    430.97/648.27 = 390.87/x
  3. Step 3: Cross multiply
    430.97x = 648.27 × 390.87
  4. Step 4: Simplify right side
    430.97x = 253,389.29
  5. Step 5: Solve for x
    x = 253,389.29/430.97
  6. Step 6: Final answer
    x = 587.96

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.