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Finding the Fourth Proportional to 256,139.88, 384,266.94 and 78,664.80

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Solution

The fourth proportional to 256,139.88, 384,266.94 and 78,664.80 is: 118,014.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,139.88 : 384,266.94 = 78,664.80 : x
  2. Step 2: Convert to fraction form
    256,139.88/384,266.94 = 78,664.80/x
  3. Step 3: Cross multiply
    256,139.88x = 384,266.94 × 78,664.80
  4. Step 4: Simplify right side
    256,139.88x = 30,228,281,981.71
  5. Step 5: Solve for x
    x = 30,228,281,981.71/256,139.88
  6. Step 6: Final answer
    x = 118,014.74

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1.5x scale

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.