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Finding the Fourth Proportional to 917.89, 1,266.70 and 718.98

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Solution

The fourth proportional to 917.89, 1,266.70 and 718.98 is: 992.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.89 : 1,266.70 = 718.98 : x
  2. Step 2: Convert to fraction form
    917.89/1,266.70 = 718.98/x
  3. Step 3: Cross multiply
    917.89x = 1,266.70 × 718.98
  4. Step 4: Simplify right side
    917.89x = 910,731.97
  5. Step 5: Solve for x
    x = 910,731.97/917.89
  6. Step 6: Final answer
    x = 992.20

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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.