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Finding the Fourth Proportional to 128,395.98, 177,191.67 and 71,034.31

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Solution

The fourth proportional to 128,395.98, 177,191.67 and 71,034.31 is: 98,030.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,395.98 : 177,191.67 = 71,034.31 : x
  2. Step 2: Convert to fraction form
    128,395.98/177,191.67 = 71,034.31/x
  3. Step 3: Cross multiply
    128,395.98x = 177,191.67 × 71,034.31
  4. Step 4: Simplify right side
    128,395.98x = 12,586,686,775.07
  5. Step 5: Solve for x
    x = 12,586,686,775.07/128,395.98
  6. Step 6: Final answer
    x = 98,030.23

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1.5x scale

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.