Home / 128,727.36-177,643.48-78,426.40

Finding the Fourth Proportional to 128,727.36, 177,643.48 and 78,426.40

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Solution

The fourth proportional to 128,727.36, 177,643.48 and 78,426.40 is: 108,228.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,727.36 : 177,643.48 = 78,426.40 : x
  2. Step 2: Convert to fraction form
    128,727.36/177,643.48 = 78,426.40/x
  3. Step 3: Cross multiply
    128,727.36x = 177,643.48 × 78,426.40
  4. Step 4: Simplify right side
    128,727.36x = 13,931,938,619.87
  5. Step 5: Solve for x
    x = 13,931,938,619.87/128,727.36
  6. Step 6: Final answer
    x = 108,228.26

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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.