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Finding the Fourth Proportional to 917.16, 1,266.16 and 622.84

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Solution

The fourth proportional to 917.16, 1,266.16 and 622.84 is: 859.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.16 : 1,266.16 = 622.84 : x
  2. Step 2: Convert to fraction form
    917.16/1,266.16 = 622.84/x
  3. Step 3: Cross multiply
    917.16x = 1,266.16 × 622.84
  4. Step 4: Simplify right side
    917.16x = 788,615.09
  5. Step 5: Solve for x
    x = 788,615.09/917.16
  6. Step 6: Final answer
    x = 859.84

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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.