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Finding the Fourth Proportional to 917.40, 1,267.06 and 622.16

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Solution

The fourth proportional to 917.40, 1,267.06 and 622.16 is: 859.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.40 : 1,267.06 = 622.16 : x
  2. Step 2: Convert to fraction form
    917.40/1,267.06 = 622.16/x
  3. Step 3: Cross multiply
    917.40x = 1,267.06 × 622.16
  4. Step 4: Simplify right side
    917.40x = 788,304.60
  5. Step 5: Solve for x
    x = 788,304.60/917.40
  6. Step 6: Final answer
    x = 859.28

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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.