Home / 85,618.10-128,428.02-38,235.60

Finding the Fourth Proportional to 85,618.10, 128,428.02 and 38,235.60

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Solution

The fourth proportional to 85,618.10, 128,428.02 and 38,235.60 is: 57,353.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,618.10 : 128,428.02 = 38,235.60 : x
  2. Step 2: Convert to fraction form
    85,618.10/128,428.02 = 38,235.60/x
  3. Step 3: Cross multiply
    85,618.10x = 128,428.02 × 38,235.60
  4. Step 4: Simplify right side
    85,618.10x = 4,910,522,401.51
  5. Step 5: Solve for x
    x = 4,910,522,401.51/85,618.10
  6. Step 6: Final answer
    x = 57,353.79

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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.