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Finding the Fourth Proportional to 1,384.31, 2,076.47 and 653.51

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Solution

The fourth proportional to 1,384.31, 2,076.47 and 653.51 is: 980.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,384.31 : 2,076.47 = 653.51 : x
  2. Step 2: Convert to fraction form
    1,384.31/2,076.47 = 653.51/x
  3. Step 3: Cross multiply
    1,384.31x = 2,076.47 × 653.51
  4. Step 4: Simplify right side
    1,384.31x = 1,356,993.91
  5. Step 5: Solve for x
    x = 1,356,993.91/1,384.31
  6. Step 6: Final answer
    x = 980.27

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.