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Finding the Fourth Proportional to 877.88, 1,213.21 and 720.26

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Solution

The fourth proportional to 877.88, 1,213.21 and 720.26 is: 995.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.88 : 1,213.21 = 720.26 : x
  2. Step 2: Convert to fraction form
    877.88/1,213.21 = 720.26/x
  3. Step 3: Cross multiply
    877.88x = 1,213.21 × 720.26
  4. Step 4: Simplify right side
    877.88x = 873,826.63
  5. Step 5: Solve for x
    x = 873,826.63/877.88
  6. Step 6: Final answer
    x = 995.38

Related Problems

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Half scale
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Double scale
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Similar ratio
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1.5x scale

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.