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Finding the Fourth Proportional to 85,381.80, 128,145.60 and 38,069.70

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Solution

The fourth proportional to 85,381.80, 128,145.60 and 38,069.70 is: 57,137.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,381.80 : 128,145.60 = 38,069.70 : x
  2. Step 2: Convert to fraction form
    85,381.80/128,145.60 = 38,069.70/x
  3. Step 3: Cross multiply
    85,381.80x = 128,145.60 × 38,069.70
  4. Step 4: Simplify right side
    85,381.80x = 4,878,464,548.32
  5. Step 5: Solve for x
    x = 4,878,464,548.32/85,381.80
  6. Step 6: Final answer
    x = 57,137.05

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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.