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Finding the Fourth Proportional to 640.16, 876.04 and 626.72

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Solution

The fourth proportional to 640.16, 876.04 and 626.72 is: 857.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.16 : 876.04 = 626.72 : x
  2. Step 2: Convert to fraction form
    640.16/876.04 = 626.72/x
  3. Step 3: Cross multiply
    640.16x = 876.04 × 626.72
  4. Step 4: Simplify right side
    640.16x = 549,031.79
  5. Step 5: Solve for x
    x = 549,031.79/640.16
  6. Step 6: Final answer
    x = 857.65

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.