Home / 85,831.20-128,746.80-79,999.20

Finding the Fourth Proportional to 85,831.20, 128,746.80 and 79,999.20

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Solution

The fourth proportional to 85,831.20, 128,746.80 and 79,999.20 is: 119,998.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,831.20 : 128,746.80 = 79,999.20 : x
  2. Step 2: Convert to fraction form
    85,831.20/128,746.80 = 79,999.20/x
  3. Step 3: Cross multiply
    85,831.20x = 128,746.80 × 79,999.20
  4. Step 4: Simplify right side
    85,831.20x = 10,299,641,002.56
  5. Step 5: Solve for x
    x = 10,299,641,002.56/85,831.20
  6. Step 6: Final answer
    x = 119,998.80

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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.