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Finding the Fourth Proportional to 85,424.40, 128,136.60 and 38,039.40

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Solution

The fourth proportional to 85,424.40, 128,136.60 and 38,039.40 is: 57,059.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,424.40 : 128,136.60 = 38,039.40 : x
  2. Step 2: Convert to fraction form
    85,424.40/128,136.60 = 38,039.40/x
  3. Step 3: Cross multiply
    85,424.40x = 128,136.60 × 38,039.40
  4. Step 4: Simplify right side
    85,424.40x = 4,874,239,382.04
  5. Step 5: Solve for x
    x = 4,874,239,382.04/85,424.40
  6. Step 6: Final answer
    x = 57,059.10

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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.