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Finding the Fourth Proportional to 1,085.89, 1,628.70 and 436.63

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Solution

The fourth proportional to 1,085.89, 1,628.70 and 436.63 is: 654.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,085.89 : 1,628.70 = 436.63 : x
  2. Step 2: Convert to fraction form
    1,085.89/1,628.70 = 436.63/x
  3. Step 3: Cross multiply
    1,085.89x = 1,628.70 × 436.63
  4. Step 4: Simplify right side
    1,085.89x = 711,139.28
  5. Step 5: Solve for x
    x = 711,139.28/1,085.89
  6. Step 6: Final answer
    x = 654.89

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Double scale
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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.