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Finding the Fourth Proportional to 85,478.40, 128,217.60 and 22,298.40

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Solution

The fourth proportional to 85,478.40, 128,217.60 and 22,298.40 is: 33,447.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,478.40 : 128,217.60 = 22,298.40 : x
  2. Step 2: Convert to fraction form
    85,478.40/128,217.60 = 22,298.40/x
  3. Step 3: Cross multiply
    85,478.40x = 128,217.60 × 22,298.40
  4. Step 4: Simplify right side
    85,478.40x = 2,859,047,331.84
  5. Step 5: Solve for x
    x = 2,859,047,331.84/85,478.40
  6. Step 6: Final answer
    x = 33,447.60

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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.