Home / 100,728.87-139,002.93-55,406.85

Finding the Fourth Proportional to 100,728.87, 139,002.93 and 55,406.85

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Solution

The fourth proportional to 100,728.87, 139,002.93 and 55,406.85 is: 76,459.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,728.87 : 139,002.93 = 55,406.85 : x
  2. Step 2: Convert to fraction form
    100,728.87/139,002.93 = 55,406.85/x
  3. Step 3: Cross multiply
    100,728.87x = 139,002.93 × 55,406.85
  4. Step 4: Simplify right side
    100,728.87x = 7,701,714,492.07
  5. Step 5: Solve for x
    x = 7,701,714,492.07/100,728.87
  6. Step 6: Final answer
    x = 76,459.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.