Home / 85,831.60-128,747.40-81,238.90

Finding the Fourth Proportional to 85,831.60, 128,747.40 and 81,238.90

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Solution

The fourth proportional to 85,831.60, 128,747.40 and 81,238.90 is: 121,858.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,831.60 : 128,747.40 = 81,238.90 : x
  2. Step 2: Convert to fraction form
    85,831.60/128,747.40 = 81,238.90/x
  3. Step 3: Cross multiply
    85,831.60x = 128,747.40 × 81,238.90
  4. Step 4: Simplify right side
    85,831.60x = 10,459,297,153.86
  5. Step 5: Solve for x
    x = 10,459,297,153.86/85,831.60
  6. Step 6: Final answer
    x = 121,858.35

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Similar ratio
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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.