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Finding the Fourth Proportional to 628.24, 865.08 and 497.20

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Solution

The fourth proportional to 628.24, 865.08 and 497.20 is: 684.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.24 : 865.08 = 497.20 : x
  2. Step 2: Convert to fraction form
    628.24/865.08 = 497.20/x
  3. Step 3: Cross multiply
    628.24x = 865.08 × 497.20
  4. Step 4: Simplify right side
    628.24x = 430,117.78
  5. Step 5: Solve for x
    x = 430,117.78/628.24
  6. Step 6: Final answer
    x = 684.64

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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.