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Finding the Fourth Proportional to 1,085.70, 1,628.48 and 469.10

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Solution

The fourth proportional to 1,085.70, 1,628.48 and 469.10 is: 703.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,085.70 : 1,628.48 = 469.10 : x
  2. Step 2: Convert to fraction form
    1,085.70/1,628.48 = 469.10/x
  3. Step 3: Cross multiply
    1,085.70x = 1,628.48 × 469.10
  4. Step 4: Simplify right side
    1,085.70x = 763,919.97
  5. Step 5: Solve for x
    x = 763,919.97/1,085.70
  6. Step 6: Final answer
    x = 703.62

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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.