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Finding the Fourth Proportional to 917.99, 1,267.86 and 622.74

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Solution

The fourth proportional to 917.99, 1,267.86 and 622.74 is: 860.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.99 : 1,267.86 = 622.74 : x
  2. Step 2: Convert to fraction form
    917.99/1,267.86 = 622.74/x
  3. Step 3: Cross multiply
    917.99x = 1,267.86 × 622.74
  4. Step 4: Simplify right side
    917.99x = 789,547.14
  5. Step 5: Solve for x
    x = 789,547.14/917.99
  6. Step 6: Final answer
    x = 860.08

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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.