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Finding the Fourth Proportional to 128,701.98, 177,617.91 and 77,726.94

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Solution

The fourth proportional to 128,701.98, 177,617.91 and 77,726.94 is: 107,268.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,701.98 : 177,617.91 = 77,726.94 : x
  2. Step 2: Convert to fraction form
    128,701.98/177,617.91 = 77,726.94/x
  3. Step 3: Cross multiply
    128,701.98x = 177,617.91 × 77,726.94
  4. Step 4: Simplify right side
    128,701.98x = 13,805,696,633.50
  5. Step 5: Solve for x
    x = 13,805,696,633.50/128,701.98
  6. Step 6: Final answer
    x = 107,268.72

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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.