Home / 128,982.84-178,013.19-72,394.22

Finding the Fourth Proportional to 128,982.84, 178,013.19 and 72,394.22

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Solution

The fourth proportional to 128,982.84, 178,013.19 and 72,394.22 is: 99,913.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,982.84 : 178,013.19 = 72,394.22 : x
  2. Step 2: Convert to fraction form
    128,982.84/178,013.19 = 72,394.22/x
  3. Step 3: Cross multiply
    128,982.84x = 178,013.19 × 72,394.22
  4. Step 4: Simplify right side
    128,982.84x = 12,887,125,149.70
  5. Step 5: Solve for x
    x = 12,887,125,149.70/128,982.84
  6. Step 6: Final answer
    x = 99,913.49

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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.