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Finding the Fourth Proportional to 128,411.10, 192,637.17 and 39,643.74

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Solution

The fourth proportional to 128,411.10, 192,637.17 and 39,643.74 is: 59,471.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,411.10 : 192,637.17 = 39,643.74 : x
  2. Step 2: Convert to fraction form
    128,411.10/192,637.17 = 39,643.74/x
  3. Step 3: Cross multiply
    128,411.10x = 192,637.17 × 39,643.74
  4. Step 4: Simplify right side
    128,411.10x = 7,636,857,881.82
  5. Step 5: Solve for x
    x = 7,636,857,881.82/128,411.10
  6. Step 6: Final answer
    x = 59,471.95

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.