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Finding the Fourth Proportional to 611,390.13, 916,790.15 and 256,308.81

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Solution

The fourth proportional to 611,390.13, 916,790.15 and 256,308.81 is: 384,339.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,390.13 : 916,790.15 = 256,308.81 : x
  2. Step 2: Convert to fraction form
    611,390.13/916,790.15 = 256,308.81/x
  3. Step 3: Cross multiply
    611,390.13x = 916,790.15 × 256,308.81
  4. Step 4: Simplify right side
    611,390.13x = 234,981,391,084.68
  5. Step 5: Solve for x
    x = 234,981,391,084.68/611,390.13
  6. Step 6: Final answer
    x = 384,339.52

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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.