Home / 121,989.02-168,044.05-103,781.43

Finding the Fourth Proportional to 121,989.02, 168,044.05 and 103,781.43

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Solution

The fourth proportional to 121,989.02, 168,044.05 and 103,781.43 is: 142,962.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,989.02 : 168,044.05 = 103,781.43 : x
  2. Step 2: Convert to fraction form
    121,989.02/168,044.05 = 103,781.43/x
  3. Step 3: Cross multiply
    121,989.02x = 168,044.05 × 103,781.43
  4. Step 4: Simplify right side
    121,989.02x = 17,439,851,811.99
  5. Step 5: Solve for x
    x = 17,439,851,811.99/121,989.02
  6. Step 6: Final answer
    x = 142,962.47

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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.