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Finding the Fourth Proportional to 656.22, 899.13 and 647.55

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Solution

The fourth proportional to 656.22, 899.13 and 647.55 is: 887.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.22 : 899.13 = 647.55 : x
  2. Step 2: Convert to fraction form
    656.22/899.13 = 647.55/x
  3. Step 3: Cross multiply
    656.22x = 899.13 × 647.55
  4. Step 4: Simplify right side
    656.22x = 582,231.63
  5. Step 5: Solve for x
    x = 582,231.63/656.22
  6. Step 6: Final answer
    x = 887.25

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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.