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Finding the Fourth Proportional to 407,856.70, 611,785.05 and 266,139.10

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Solution

The fourth proportional to 407,856.70, 611,785.05 and 266,139.10 is: 399,208.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    407,856.70 : 611,785.05 = 266,139.10 : x
  2. Step 2: Convert to fraction form
    407,856.70/611,785.05 = 266,139.10/x
  3. Step 3: Cross multiply
    407,856.70x = 611,785.05 × 266,139.10
  4. Step 4: Simplify right side
    407,856.70x = 162,819,922,600.46
  5. Step 5: Solve for x
    x = 162,819,922,600.46/407,856.70
  6. Step 6: Final answer
    x = 399,208.65

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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.