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Finding the Fourth Proportional to 440, 607.20 and 256

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Solution

The fourth proportional to 440, 607.20 and 256 is: 353.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    440 : 607.20 = 256 : x
  2. Step 2: Convert to fraction form
    440/607.20 = 256/x
  3. Step 3: Cross multiply
    440x = 607.20 × 256
  4. Step 4: Simplify right side
    440x = 155,443.20
  5. Step 5: Solve for x
    x = 155,443.20/440
  6. Step 6: Final answer
    x = 353.28

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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.