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Finding the Fourth Proportional to 640.04, 959.34 and 315.64

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Solution

The fourth proportional to 640.04, 959.34 and 315.64 is: 473.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.04 : 959.34 = 315.64 : x
  2. Step 2: Convert to fraction form
    640.04/959.34 = 315.64/x
  3. Step 3: Cross multiply
    640.04x = 959.34 × 315.64
  4. Step 4: Simplify right side
    640.04x = 302,801.28
  5. Step 5: Solve for x
    x = 302,801.28/640.04
  6. Step 6: Final answer
    x = 473.10

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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.