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Finding the Fourth Proportional to 112,239.52, 154,890 and 61,941.60

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Solution

The fourth proportional to 112,239.52, 154,890 and 61,941.60 is: 85,479.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,239.52 : 154,890 = 61,941.60 : x
  2. Step 2: Convert to fraction form
    112,239.52/154,890 = 61,941.60/x
  3. Step 3: Cross multiply
    112,239.52x = 154,890 × 61,941.60
  4. Step 4: Simplify right side
    112,239.52x = 9,594,134,424
  5. Step 5: Solve for x
    x = 9,594,134,424/112,239.52
  6. Step 6: Final answer
    x = 85,479.11

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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.