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Finding the Fourth Proportional to 85,855.84, 128,783.12 and 26,691.40

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Solution

The fourth proportional to 85,855.84, 128,783.12 and 26,691.40 is: 40,036.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,855.84 : 128,783.12 = 26,691.40 : x
  2. Step 2: Convert to fraction form
    85,855.84/128,783.12 = 26,691.40/x
  3. Step 3: Cross multiply
    85,855.84x = 128,783.12 × 26,691.40
  4. Step 4: Simplify right side
    85,855.84x = 3,437,401,769.17
  5. Step 5: Solve for x
    x = 3,437,401,769.17/85,855.84
  6. Step 6: Final answer
    x = 40,036.90

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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.