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Finding the Fourth Proportional to 917.21, 1,265.16 and 622.98

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Solution

The fourth proportional to 917.21, 1,265.16 and 622.98 is: 859.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.21 : 1,265.16 = 622.98 : x
  2. Step 2: Convert to fraction form
    917.21/1,265.16 = 622.98/x
  3. Step 3: Cross multiply
    917.21x = 1,265.16 × 622.98
  4. Step 4: Simplify right side
    917.21x = 788,169.38
  5. Step 5: Solve for x
    x = 788,169.38/917.21
  6. Step 6: Final answer
    x = 859.32

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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.