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Finding the Fourth Proportional to 256,895.80, 385,410.90 and 99,129.40

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Solution

The fourth proportional to 256,895.80, 385,410.90 and 99,129.40 is: 148,720.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,895.80 : 385,410.90 = 99,129.40 : x
  2. Step 2: Convert to fraction form
    256,895.80/385,410.90 = 99,129.40/x
  3. Step 3: Cross multiply
    256,895.80x = 385,410.90 × 99,129.40
  4. Step 4: Simplify right side
    256,895.80x = 38,205,551,270.46
  5. Step 5: Solve for x
    x = 38,205,551,270.46/256,895.80
  6. Step 6: Final answer
    x = 148,720.03

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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.