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Finding the Fourth Proportional to 128,810.79, 193,154.83 and 47,731.41

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Solution

The fourth proportional to 128,810.79, 193,154.83 and 47,731.41 is: 71,574.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,810.79 : 193,154.83 = 47,731.41 : x
  2. Step 2: Convert to fraction form
    128,810.79/193,154.83 = 47,731.41/x
  3. Step 3: Cross multiply
    128,810.79x = 193,154.83 × 47,731.41
  4. Step 4: Simplify right side
    128,810.79x = 9,219,552,264.88
  5. Step 5: Solve for x
    x = 9,219,552,264.88/128,810.79
  6. Step 6: Final answer
    x = 71,574.38

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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.