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Finding the Fourth Proportional to 1,240.89, 1,851.20 and 1,152.51

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Solution

The fourth proportional to 1,240.89, 1,851.20 and 1,152.51 is: 1,719.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.89 : 1,851.20 = 1,152.51 : x
  2. Step 2: Convert to fraction form
    1,240.89/1,851.20 = 1,152.51/x
  3. Step 3: Cross multiply
    1,240.89x = 1,851.20 × 1,152.51
  4. Step 4: Simplify right side
    1,240.89x = 2,133,520.75
  5. Step 5: Solve for x
    x = 2,133,520.75/1,240.89
  6. Step 6: Final answer
    x = 1,719.35

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.