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Finding the Fourth Proportional to 85,812.40, 128,718.60 and 54,319.60

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Solution

The fourth proportional to 85,812.40, 128,718.60 and 54,319.60 is: 81,479.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,812.40 : 128,718.60 = 54,319.60 : x
  2. Step 2: Convert to fraction form
    85,812.40/128,718.60 = 54,319.60/x
  3. Step 3: Cross multiply
    85,812.40x = 128,718.60 × 54,319.60
  4. Step 4: Simplify right side
    85,812.40x = 6,991,942,864.56
  5. Step 5: Solve for x
    x = 6,991,942,864.56/85,812.40
  6. Step 6: Final answer
    x = 81,479.40

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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.