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Finding the Fourth Proportional to 128,637.65, 177,463.37 and 77,621.94

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Solution

The fourth proportional to 128,637.65, 177,463.37 and 77,621.94 is: 107,084.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,637.65 : 177,463.37 = 77,621.94 : x
  2. Step 2: Convert to fraction form
    128,637.65/177,463.37 = 77,621.94/x
  3. Step 3: Cross multiply
    128,637.65x = 177,463.37 × 77,621.94
  4. Step 4: Simplify right side
    128,637.65x = 13,775,050,670.23
  5. Step 5: Solve for x
    x = 13,775,050,670.23/128,637.65
  6. Step 6: Final answer
    x = 107,084.13

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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.