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Finding the Fourth Proportional to 111,861, 154,368.20 and 61,560

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Solution

The fourth proportional to 111,861, 154,368.20 and 61,560 is: 84,952.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,861 : 154,368.20 = 61,560 : x
  2. Step 2: Convert to fraction form
    111,861/154,368.20 = 61,560/x
  3. Step 3: Cross multiply
    111,861x = 154,368.20 × 61,560
  4. Step 4: Simplify right side
    111,861x = 9,502,906,392
  5. Step 5: Solve for x
    x = 9,502,906,392/111,861
  6. Step 6: Final answer
    x = 84,952.81

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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.