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Finding the Fourth Proportional to 128,876.16, 177,840 and 71,518.44

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Solution

The fourth proportional to 128,876.16, 177,840 and 71,518.44 is: 98,690.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,876.16 : 177,840 = 71,518.44 : x
  2. Step 2: Convert to fraction form
    128,876.16/177,840 = 71,518.44/x
  3. Step 3: Cross multiply
    128,876.16x = 177,840 × 71,518.44
  4. Step 4: Simplify right side
    128,876.16x = 12,718,839,369.60
  5. Step 5: Solve for x
    x = 12,718,839,369.60/128,876.16
  6. Step 6: Final answer
    x = 98,690.40

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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.