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Finding the Fourth Proportional to 111,687.66, 154,129.47 and 61,389.90

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Solution

The fourth proportional to 111,687.66, 154,129.47 and 61,389.90 is: 84,718.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,687.66 : 154,129.47 = 61,389.90 : x
  2. Step 2: Convert to fraction form
    111,687.66/154,129.47 = 61,389.90/x
  3. Step 3: Cross multiply
    111,687.66x = 154,129.47 × 61,389.90
  4. Step 4: Simplify right side
    111,687.66x = 9,461,992,750.35
  5. Step 5: Solve for x
    x = 9,461,992,750.35/111,687.66
  6. Step 6: Final answer
    x = 84,718.34

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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.