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Finding the Fourth Proportional to 917.98, 1,265.83 and 718.43

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Solution

The fourth proportional to 917.98, 1,265.83 and 718.43 is: 990.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.98 : 1,265.83 = 718.43 : x
  2. Step 2: Convert to fraction form
    917.98/1,265.83 = 718.43/x
  3. Step 3: Cross multiply
    917.98x = 1,265.83 × 718.43
  4. Step 4: Simplify right side
    917.98x = 909,402.12
  5. Step 5: Solve for x
    x = 909,402.12/917.98
  6. Step 6: Final answer
    x = 990.66

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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.