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Finding the Fourth Proportional to 128,762.98, 177,626.86 and 77,747.56

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Solution

The fourth proportional to 128,762.98, 177,626.86 and 77,747.56 is: 107,251.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,762.98 : 177,626.86 = 77,747.56 : x
  2. Step 2: Convert to fraction form
    128,762.98/177,626.86 = 77,747.56/x
  3. Step 3: Cross multiply
    128,762.98x = 177,626.86 × 77,747.56
  4. Step 4: Simplify right side
    128,762.98x = 13,810,054,955.46
  5. Step 5: Solve for x
    x = 13,810,054,955.46/128,762.98
  6. Step 6: Final answer
    x = 107,251.75

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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.