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Finding the Fourth Proportional to 1,081.90, 1,492.08 and 708.90

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Solution

The fourth proportional to 1,081.90, 1,492.08 and 708.90 is: 977.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.90 : 1,492.08 = 708.90 : x
  2. Step 2: Convert to fraction form
    1,081.90/1,492.08 = 708.90/x
  3. Step 3: Cross multiply
    1,081.90x = 1,492.08 × 708.90
  4. Step 4: Simplify right side
    1,081.90x = 1,057,735.51
  5. Step 5: Solve for x
    x = 1,057,735.51/1,081.90
  6. Step 6: Final answer
    x = 977.66

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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.