Home / 218,971.56-302,180.95-128,309.47

Finding the Fourth Proportional to 218,971.56, 302,180.95 and 128,309.47

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Solution

The fourth proportional to 218,971.56, 302,180.95 and 128,309.47 is: 177,067.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,971.56 : 302,180.95 = 128,309.47 : x
  2. Step 2: Convert to fraction form
    218,971.56/302,180.95 = 128,309.47/x
  3. Step 3: Cross multiply
    218,971.56x = 302,180.95 × 128,309.47
  4. Step 4: Simplify right side
    218,971.56x = 38,772,677,538.60
  5. Step 5: Solve for x
    x = 38,772,677,538.60/218,971.56
  6. Step 6: Final answer
    x = 177,067.18

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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.