Home / 128,631.66-177,506.55-72,040.14

Finding the Fourth Proportional to 128,631.66, 177,506.55 and 72,040.14

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Solution

The fourth proportional to 128,631.66, 177,506.55 and 72,040.14 is: 99,412.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,631.66 : 177,506.55 = 72,040.14 : x
  2. Step 2: Convert to fraction form
    128,631.66/177,506.55 = 72,040.14/x
  3. Step 3: Cross multiply
    128,631.66x = 177,506.55 × 72,040.14
  4. Step 4: Simplify right side
    128,631.66x = 12,787,596,712.92
  5. Step 5: Solve for x
    x = 12,787,596,712.92/128,631.66
  6. Step 6: Final answer
    x = 99,412.51

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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.