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Finding the Fourth Proportional to 891.02, 1,228.20 and 680.51

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Solution

The fourth proportional to 891.02, 1,228.20 and 680.51 is: 938.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.02 : 1,228.20 = 680.51 : x
  2. Step 2: Convert to fraction form
    891.02/1,228.20 = 680.51/x
  3. Step 3: Cross multiply
    891.02x = 1,228.20 × 680.51
  4. Step 4: Simplify right side
    891.02x = 835,802.38
  5. Step 5: Solve for x
    x = 835,802.38/891.02
  6. Step 6: Final answer
    x = 938.03

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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.