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Finding the Fourth Proportional to 459,812.80, 689,719.20 and 127,388.80

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Solution

The fourth proportional to 459,812.80, 689,719.20 and 127,388.80 is: 191,083.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    459,812.80 : 689,719.20 = 127,388.80 : x
  2. Step 2: Convert to fraction form
    459,812.80/689,719.20 = 127,388.80/x
  3. Step 3: Cross multiply
    459,812.80x = 689,719.20 × 127,388.80
  4. Step 4: Simplify right side
    459,812.80x = 87,862,501,224.96
  5. Step 5: Solve for x
    x = 87,862,501,224.96/459,812.80
  6. Step 6: Final answer
    x = 191,083.20

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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.