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Finding the Fourth Proportional to 1,107.42, 1,652.46 and 991.07

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Solution

The fourth proportional to 1,107.42, 1,652.46 and 991.07 is: 1,478.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,107.42 : 1,652.46 = 991.07 : x
  2. Step 2: Convert to fraction form
    1,107.42/1,652.46 = 991.07/x
  3. Step 3: Cross multiply
    1,107.42x = 1,652.46 × 991.07
  4. Step 4: Simplify right side
    1,107.42x = 1,637,693.31
  5. Step 5: Solve for x
    x = 1,637,693.31/1,107.42
  6. Step 6: Final answer
    x = 1,478.84

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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.