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Finding the Fourth Proportional to 128,664.34, 177,624 and 99,919.51

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Solution

The fourth proportional to 128,664.34, 177,624 and 99,919.51 is: 137,941.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,664.34 : 177,624 = 99,919.51 : x
  2. Step 2: Convert to fraction form
    128,664.34/177,624 = 99,919.51/x
  3. Step 3: Cross multiply
    128,664.34x = 177,624 × 99,919.51
  4. Step 4: Simplify right side
    128,664.34x = 17,748,102,600.18
  5. Step 5: Solve for x
    x = 17,748,102,600.18/128,664.34
  6. Step 6: Final answer
    x = 137,941.12

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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.