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Finding the Fourth Proportional to 1,851.78, 2,552.78 and 1,320.28

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Solution

The fourth proportional to 1,851.78, 2,552.78 and 1,320.28 is: 1,820.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,851.78 : 2,552.78 = 1,320.28 : x
  2. Step 2: Convert to fraction form
    1,851.78/2,552.78 = 1,320.28/x
  3. Step 3: Cross multiply
    1,851.78x = 2,552.78 × 1,320.28
  4. Step 4: Simplify right side
    1,851.78x = 3,370,384.38
  5. Step 5: Solve for x
    x = 3,370,384.38/1,851.78
  6. Step 6: Final answer
    x = 1,820.08

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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.