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Finding the Fourth Proportional to 85,734.76, 128,472.99 and 76,391.51

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Solution

The fourth proportional to 85,734.76, 128,472.99 and 76,391.51 is: 114,472.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,734.76 : 128,472.99 = 76,391.51 : x
  2. Step 2: Convert to fraction form
    85,734.76/128,472.99 = 76,391.51/x
  3. Step 3: Cross multiply
    85,734.76x = 128,472.99 × 76,391.51
  4. Step 4: Simplify right side
    85,734.76x = 9,814,245,923.84
  5. Step 5: Solve for x
    x = 9,814,245,923.84/85,734.76
  6. Step 6: Final answer
    x = 114,472.19

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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.