Home / 85,745.16-128,387.34-69,885.18

Finding the Fourth Proportional to 85,745.16, 128,387.34 and 69,885.18

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Solution

The fourth proportional to 85,745.16, 128,387.34 and 69,885.18 is: 104,639.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,745.16 : 128,387.34 = 69,885.18 : x
  2. Step 2: Convert to fraction form
    85,745.16/128,387.34 = 69,885.18/x
  3. Step 3: Cross multiply
    85,745.16x = 128,387.34 × 69,885.18
  4. Step 4: Simplify right side
    85,745.16x = 8,972,372,365.62
  5. Step 5: Solve for x
    x = 8,972,372,365.62/85,745.16
  6. Step 6: Final answer
    x = 104,639.99

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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.