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Finding the Fourth Proportional to 85,491.52, 128,263.20 and 60,579.84

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Solution

The fourth proportional to 85,491.52, 128,263.20 and 60,579.84 is: 90,888.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,491.52 : 128,263.20 = 60,579.84 : x
  2. Step 2: Convert to fraction form
    85,491.52/128,263.20 = 60,579.84/x
  3. Step 3: Cross multiply
    85,491.52x = 128,263.20 × 60,579.84
  4. Step 4: Simplify right side
    85,491.52x = 7,770,164,133.89
  5. Step 5: Solve for x
    x = 7,770,164,133.89/85,491.52
  6. Step 6: Final answer
    x = 90,888.13

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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.