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Finding the Fourth Proportional to 128,964.66, 177,987.63 and 72,376.03

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Solution

The fourth proportional to 128,964.66, 177,987.63 and 72,376.03 is: 99,888.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,964.66 : 177,987.63 = 72,376.03 : x
  2. Step 2: Convert to fraction form
    128,964.66/177,987.63 = 72,376.03/x
  3. Step 3: Cross multiply
    128,964.66x = 177,987.63 × 72,376.03
  4. Step 4: Simplify right side
    128,964.66x = 12,882,038,135.29
  5. Step 5: Solve for x
    x = 12,882,038,135.29/128,964.66
  6. Step 6: Final answer
    x = 99,888.13

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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.