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Finding the Fourth Proportional to 256,856.48, 385,143.36 and 79,314.56

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Solution

The fourth proportional to 256,856.48, 385,143.36 and 79,314.56 is: 118,928.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,856.48 : 385,143.36 = 79,314.56 : x
  2. Step 2: Convert to fraction form
    256,856.48/385,143.36 = 79,314.56/x
  3. Step 3: Cross multiply
    256,856.48x = 385,143.36 × 79,314.56
  4. Step 4: Simplify right side
    256,856.48x = 30,547,476,135.32
  5. Step 5: Solve for x
    x = 30,547,476,135.32/256,856.48
  6. Step 6: Final answer
    x = 118,928.19

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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.