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Finding the Fourth Proportional to 112,124.87, 154,730.34 and 61,138

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Solution

The fourth proportional to 112,124.87, 154,730.34 and 61,138 is: 84,369.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,124.87 : 154,730.34 = 61,138 : x
  2. Step 2: Convert to fraction form
    112,124.87/154,730.34 = 61,138/x
  3. Step 3: Cross multiply
    112,124.87x = 154,730.34 × 61,138
  4. Step 4: Simplify right side
    112,124.87x = 9,459,903,526.92
  5. Step 5: Solve for x
    x = 9,459,903,526.92/112,124.87
  6. Step 6: Final answer
    x = 84,369.36

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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.