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Finding the Fourth Proportional to 889.21, 1,225.58 and 667.78

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Solution

The fourth proportional to 889.21, 1,225.58 and 667.78 is: 920.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.21 : 1,225.58 = 667.78 : x
  2. Step 2: Convert to fraction form
    889.21/1,225.58 = 667.78/x
  3. Step 3: Cross multiply
    889.21x = 1,225.58 × 667.78
  4. Step 4: Simplify right side
    889.21x = 818,415.17
  5. Step 5: Solve for x
    x = 818,415.17/889.21
  6. Step 6: Final answer
    x = 920.38

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Double scale
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1.5x scale

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.