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Finding the Fourth Proportional to 85,363.65, 128,045.48 and 60,431.85

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Solution

The fourth proportional to 85,363.65, 128,045.48 and 60,431.85 is: 90,647.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,363.65 : 128,045.48 = 60,431.85 : x
  2. Step 2: Convert to fraction form
    85,363.65/128,045.48 = 60,431.85/x
  3. Step 3: Cross multiply
    85,363.65x = 128,045.48 × 60,431.85
  4. Step 4: Simplify right side
    85,363.65x = 7,738,024,938.38
  5. Step 5: Solve for x
    x = 7,738,024,938.38/85,363.65
  6. Step 6: Final answer
    x = 90,647.78

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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.