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Finding the Fourth Proportional to 639.16, 953.36 and 535.24

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Solution

The fourth proportional to 639.16, 953.36 and 535.24 is: 798.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.16 : 953.36 = 535.24 : x
  2. Step 2: Convert to fraction form
    639.16/953.36 = 535.24/x
  3. Step 3: Cross multiply
    639.16x = 953.36 × 535.24
  4. Step 4: Simplify right side
    639.16x = 510,276.41
  5. Step 5: Solve for x
    x = 510,276.41/639.16
  6. Step 6: Final answer
    x = 798.35

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.