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Finding the Fourth Proportional to 85,464.40, 128,196.60 and 38,079.40

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Solution

The fourth proportional to 85,464.40, 128,196.60 and 38,079.40 is: 57,119.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,464.40 : 128,196.60 = 38,079.40 : x
  2. Step 2: Convert to fraction form
    85,464.40/128,196.60 = 38,079.40/x
  3. Step 3: Cross multiply
    85,464.40x = 128,196.60 × 38,079.40
  4. Step 4: Simplify right side
    85,464.40x = 4,881,649,610.04
  5. Step 5: Solve for x
    x = 4,881,649,610.04/85,464.40
  6. Step 6: Final answer
    x = 57,119.10

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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.