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Finding the Fourth Proportional to 85,908.15, 128,810.45 and 38,514.67

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Solution

The fourth proportional to 85,908.15, 128,810.45 and 38,514.67 is: 57,748.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,908.15 : 128,810.45 = 38,514.67 : x
  2. Step 2: Convert to fraction form
    85,908.15/128,810.45 = 38,514.67/x
  3. Step 3: Cross multiply
    85,908.15x = 128,810.45 × 38,514.67
  4. Step 4: Simplify right side
    85,908.15x = 4,961,091,974.30
  5. Step 5: Solve for x
    x = 4,961,091,974.30/85,908.15
  6. Step 6: Final answer
    x = 57,748.79

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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.