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Finding the Fourth Proportional to 305,719.40, 458,579.10 and 81,079.40

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Solution

The fourth proportional to 305,719.40, 458,579.10 and 81,079.40 is: 121,619.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    305,719.40 : 458,579.10 = 81,079.40 : x
  2. Step 2: Convert to fraction form
    305,719.40/458,579.10 = 81,079.40/x
  3. Step 3: Cross multiply
    305,719.40x = 458,579.10 × 81,079.40
  4. Step 4: Simplify right side
    305,719.40x = 37,181,318,280.54
  5. Step 5: Solve for x
    x = 37,181,318,280.54/305,719.40
  6. Step 6: Final answer
    x = 121,619.10

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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.