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Finding the Fourth Proportional to 646.13, 969.20 and 256.11

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Solution

The fourth proportional to 646.13, 969.20 and 256.11 is: 384.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.13 : 969.20 = 256.11 : x
  2. Step 2: Convert to fraction form
    646.13/969.20 = 256.11/x
  3. Step 3: Cross multiply
    646.13x = 969.20 × 256.11
  4. Step 4: Simplify right side
    646.13x = 248,221.81
  5. Step 5: Solve for x
    x = 248,221.81/646.13
  6. Step 6: Final answer
    x = 384.17

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Similar ratio
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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.