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Finding the Fourth Proportional to 85,855.40, 128,783.10 and 38,470.40

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Solution

The fourth proportional to 85,855.40, 128,783.10 and 38,470.40 is: 57,705.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,855.40 : 128,783.10 = 38,470.40 : x
  2. Step 2: Convert to fraction form
    85,855.40/128,783.10 = 38,470.40/x
  3. Step 3: Cross multiply
    85,855.40x = 128,783.10 × 38,470.40
  4. Step 4: Simplify right side
    85,855.40x = 4,954,337,370.24
  5. Step 5: Solve for x
    x = 4,954,337,370.24/85,855.40
  6. Step 6: Final answer
    x = 57,705.60

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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.