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Finding the Fourth Proportional to 128,966.02, 177,978.67 and 71,605.36

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Solution

The fourth proportional to 128,966.02, 177,978.67 and 71,605.36 is: 98,818.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,966.02 : 177,978.67 = 71,605.36 : x
  2. Step 2: Convert to fraction form
    128,966.02/177,978.67 = 71,605.36/x
  3. Step 3: Cross multiply
    128,966.02x = 177,978.67 × 71,605.36
  4. Step 4: Simplify right side
    128,966.02x = 12,744,226,655.99
  5. Step 5: Solve for x
    x = 12,744,226,655.99/128,966.02
  6. Step 6: Final answer
    x = 98,818.48

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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.