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Finding the Fourth Proportional to 1,383.60, 2,076.12 and 653.18

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Solution

The fourth proportional to 1,383.60, 2,076.12 and 653.18 is: 980.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,383.60 : 2,076.12 = 653.18 : x
  2. Step 2: Convert to fraction form
    1,383.60/2,076.12 = 653.18/x
  3. Step 3: Cross multiply
    1,383.60x = 2,076.12 × 653.18
  4. Step 4: Simplify right side
    1,383.60x = 1,356,080.06
  5. Step 5: Solve for x
    x = 1,356,080.06/1,383.60
  6. Step 6: Final answer
    x = 980.11

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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.