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Finding the Fourth Proportional to 889.10, 1,225.75 and 665.36

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Solution

The fourth proportional to 889.10, 1,225.75 and 665.36 is: 917.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.10 : 1,225.75 = 665.36 : x
  2. Step 2: Convert to fraction form
    889.10/1,225.75 = 665.36/x
  3. Step 3: Cross multiply
    889.10x = 1,225.75 × 665.36
  4. Step 4: Simplify right side
    889.10x = 815,561.69
  5. Step 5: Solve for x
    x = 815,561.69/889.10
  6. Step 6: Final answer
    x = 917.29

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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.