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Finding the Fourth Proportional to 111,987.42, 154,542.65 and 61,686.42

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Solution

The fourth proportional to 111,987.42, 154,542.65 and 61,686.42 is: 85,127.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,987.42 : 154,542.65 = 61,686.42 : x
  2. Step 2: Convert to fraction form
    111,987.42/154,542.65 = 61,686.42/x
  3. Step 3: Cross multiply
    111,987.42x = 154,542.65 × 61,686.42
  4. Step 4: Simplify right side
    111,987.42x = 9,533,182,815.81
  5. Step 5: Solve for x
    x = 9,533,182,815.81/111,987.42
  6. Step 6: Final answer
    x = 85,127.27

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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.