Home / 128,219.10-176,880.15-90,410.46

Finding the Fourth Proportional to 128,219.10, 176,880.15 and 90,410.46

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Solution

The fourth proportional to 128,219.10, 176,880.15 and 90,410.46 is: 124,722.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,219.10 : 176,880.15 = 90,410.46 : x
  2. Step 2: Convert to fraction form
    128,219.10/176,880.15 = 90,410.46/x
  3. Step 3: Cross multiply
    128,219.10x = 176,880.15 × 90,410.46
  4. Step 4: Simplify right side
    128,219.10x = 15,991,815,726.37
  5. Step 5: Solve for x
    x = 15,991,815,726.37/128,219.10
  6. Step 6: Final answer
    x = 124,722.57

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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.