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Finding the Fourth Proportional to 111,720.90, 154,123.47 and 98,987.07

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Solution

The fourth proportional to 111,720.90, 154,123.47 and 98,987.07 is: 136,556.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,720.90 : 154,123.47 = 98,987.07 : x
  2. Step 2: Convert to fraction form
    111,720.90/154,123.47 = 98,987.07/x
  3. Step 3: Cross multiply
    111,720.90x = 154,123.47 × 98,987.07
  4. Step 4: Simplify right side
    111,720.90x = 15,256,230,713.53
  5. Step 5: Solve for x
    x = 15,256,230,713.53/111,720.90
  6. Step 6: Final answer
    x = 136,556.64

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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.