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Finding the Fourth Proportional to 464.60, 640.58 and 390.76

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Solution

The fourth proportional to 464.60, 640.58 and 390.76 is: 538.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    464.60 : 640.58 = 390.76 : x
  2. Step 2: Convert to fraction form
    464.60/640.58 = 390.76/x
  3. Step 3: Cross multiply
    464.60x = 640.58 × 390.76
  4. Step 4: Simplify right side
    464.60x = 250,309.49
  5. Step 5: Solve for x
    x = 250,309.49/464.60
  6. Step 6: Final answer
    x = 538.76

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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.