Home / 128,955.13-177,958.18-72,366.51

Finding the Fourth Proportional to 128,955.13, 177,958.18 and 72,366.51

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Solution

The fourth proportional to 128,955.13, 177,958.18 and 72,366.51 is: 99,865.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,955.13 : 177,958.18 = 72,366.51 : x
  2. Step 2: Convert to fraction form
    128,955.13/177,958.18 = 72,366.51/x
  3. Step 3: Cross multiply
    128,955.13x = 177,958.18 × 72,366.51
  4. Step 4: Simplify right side
    128,955.13x = 12,878,211,341.84
  5. Step 5: Solve for x
    x = 12,878,211,341.84/128,955.13
  6. Step 6: Final answer
    x = 99,865.83

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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.