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Finding the Fourth Proportional to 112,908, 155,916.16 and 72,690.14

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Solution

The fourth proportional to 112,908, 155,916.16 and 72,690.14 is: 100,378.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,908 : 155,916.16 = 72,690.14 : x
  2. Step 2: Convert to fraction form
    112,908/155,916.16 = 72,690.14/x
  3. Step 3: Cross multiply
    112,908x = 155,916.16 × 72,690.14
  4. Step 4: Simplify right side
    112,908x = 11,333,567,498.66
  5. Step 5: Solve for x
    x = 11,333,567,498.66/112,908
  6. Step 6: Final answer
    x = 100,378.78

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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.