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Finding the Fourth Proportional to 402.64, 555.64 and 347.28

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Solution

The fourth proportional to 402.64, 555.64 and 347.28 is: 479.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.64 : 555.64 = 347.28 : x
  2. Step 2: Convert to fraction form
    402.64/555.64 = 347.28/x
  3. Step 3: Cross multiply
    402.64x = 555.64 × 347.28
  4. Step 4: Simplify right side
    402.64x = 192,962.66
  5. Step 5: Solve for x
    x = 192,962.66/402.64
  6. Step 6: Final answer
    x = 479.24

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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.