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Finding the Fourth Proportional to 128,959.84, 177,981.96 and 72,374.32

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Solution

The fourth proportional to 128,959.84, 177,981.96 and 72,374.32 is: 99,886.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,959.84 : 177,981.96 = 72,374.32 : x
  2. Step 2: Convert to fraction form
    128,959.84/177,981.96 = 72,374.32/x
  3. Step 3: Cross multiply
    128,959.84x = 177,981.96 × 72,374.32
  4. Step 4: Simplify right side
    128,959.84x = 12,881,323,327.27
  5. Step 5: Solve for x
    x = 12,881,323,327.27/128,959.84
  6. Step 6: Final answer
    x = 99,886.32

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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.