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Finding the Fourth Proportional to 390.51, 585.80 and 228.10

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Solution

The fourth proportional to 390.51, 585.80 and 228.10 is: 342.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.51 : 585.80 = 228.10 : x
  2. Step 2: Convert to fraction form
    390.51/585.80 = 228.10/x
  3. Step 3: Cross multiply
    390.51x = 585.80 × 228.10
  4. Step 4: Simplify right side
    390.51x = 133,620.98
  5. Step 5: Solve for x
    x = 133,620.98/390.51
  6. Step 6: Final answer
    x = 342.17

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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.