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Finding the Fourth Proportional to 256,900.64, 385,387.85 and 79,421.49

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Solution

The fourth proportional to 256,900.64, 385,387.85 and 79,421.49 is: 119,143.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,900.64 : 385,387.85 = 79,421.49 : x
  2. Step 2: Convert to fraction form
    256,900.64/385,387.85 = 79,421.49/x
  3. Step 3: Cross multiply
    256,900.64x = 385,387.85 × 79,421.49
  4. Step 4: Simplify right side
    256,900.64x = 30,608,077,473.45
  5. Step 5: Solve for x
    x = 30,608,077,473.45/256,900.64
  6. Step 6: Final answer
    x = 119,143.64

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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.