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Finding the Fourth Proportional to 689,640.76, 951,689.33 and 399,264.56

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Solution

The fourth proportional to 689,640.76, 951,689.33 and 399,264.56 is: 550,976.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    689,640.76 : 951,689.33 = 399,264.56 : x
  2. Step 2: Convert to fraction form
    689,640.76/951,689.33 = 399,264.56/x
  3. Step 3: Cross multiply
    689,640.76x = 951,689.33 × 399,264.56
  4. Step 4: Simplify right side
    689,640.76x = 379,975,824,976.53
  5. Step 5: Solve for x
    x = 379,975,824,976.53/689,640.76
  6. Step 6: Final answer
    x = 550,976.46

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Double scale
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1.5x scale

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.