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Finding the Fourth Proportional to 639.64, 960.18 and 572.32

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Solution

The fourth proportional to 639.64, 960.18 and 572.32 is: 859.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.64 : 960.18 = 572.32 : x
  2. Step 2: Convert to fraction form
    639.64/960.18 = 572.32/x
  3. Step 3: Cross multiply
    639.64x = 960.18 × 572.32
  4. Step 4: Simplify right side
    639.64x = 549,530.22
  5. Step 5: Solve for x
    x = 549,530.22/639.64
  6. Step 6: Final answer
    x = 859.12

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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.