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Finding the Fourth Proportional to 995.51, 1,372.50 and 640.79

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Solution

The fourth proportional to 995.51, 1,372.50 and 640.79 is: 883.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    995.51 : 1,372.50 = 640.79 : x
  2. Step 2: Convert to fraction form
    995.51/1,372.50 = 640.79/x
  3. Step 3: Cross multiply
    995.51x = 1,372.50 × 640.79
  4. Step 4: Simplify right side
    995.51x = 879,487.71
  5. Step 5: Solve for x
    x = 879,487.71/995.51
  6. Step 6: Final answer
    x = 883.46

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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.