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Finding the Fourth Proportional to 218,630.39, 301,785.45 and 128,015.49

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Solution

The fourth proportional to 218,630.39, 301,785.45 and 128,015.49 is: 176,705.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,630.39 : 301,785.45 = 128,015.49 : x
  2. Step 2: Convert to fraction form
    218,630.39/301,785.45 = 128,015.49/x
  3. Step 3: Cross multiply
    218,630.39x = 301,785.45 × 128,015.49
  4. Step 4: Simplify right side
    218,630.39x = 38,633,211,210.71
  5. Step 5: Solve for x
    x = 38,633,211,210.71/218,630.39
  6. Step 6: Final answer
    x = 176,705.59

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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.