Home / 216,921.78-299,349-121,428.36

Finding the Fourth Proportional to 216,921.78, 299,349 and 121,428.36

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Solution

The fourth proportional to 216,921.78, 299,349 and 121,428.36 is: 167,569.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    216,921.78 : 299,349 = 121,428.36 : x
  2. Step 2: Convert to fraction form
    216,921.78/299,349 = 121,428.36/x
  3. Step 3: Cross multiply
    216,921.78x = 299,349 × 121,428.36
  4. Step 4: Simplify right side
    216,921.78x = 36,349,458,137.64
  5. Step 5: Solve for x
    x = 36,349,458,137.64/216,921.78
  6. Step 6: Final answer
    x = 167,569.43

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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.