Home / 128,789.04-177,728.64-72,200.40

Finding the Fourth Proportional to 128,789.04, 177,728.64 and 72,200.40

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Solution

The fourth proportional to 128,789.04, 177,728.64 and 72,200.40 is: 99,636.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,789.04 : 177,728.64 = 72,200.40 : x
  2. Step 2: Convert to fraction form
    128,789.04/177,728.64 = 72,200.40/x
  3. Step 3: Cross multiply
    128,789.04x = 177,728.64 × 72,200.40
  4. Step 4: Simplify right side
    128,789.04x = 12,832,078,899.46
  5. Step 5: Solve for x
    x = 12,832,078,899.46/128,789.04
  6. Step 6: Final answer
    x = 99,636.42

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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.