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Finding the Fourth Proportional to 1,091.08, 1,505.70 and 1,008.40

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Solution

The fourth proportional to 1,091.08, 1,505.70 and 1,008.40 is: 1,391.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.08 : 1,505.70 = 1,008.40 : x
  2. Step 2: Convert to fraction form
    1,091.08/1,505.70 = 1,008.40/x
  3. Step 3: Cross multiply
    1,091.08x = 1,505.70 × 1,008.40
  4. Step 4: Simplify right side
    1,091.08x = 1,518,347.88
  5. Step 5: Solve for x
    x = 1,518,347.88/1,091.08
  6. Step 6: Final answer
    x = 1,391.60

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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.