Home / 138,155.43-190,641-77,724.81

Finding the Fourth Proportional to 138,155.43, 190,641 and 77,724.81

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Solution

The fourth proportional to 138,155.43, 190,641 and 77,724.81 is: 107,252.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,155.43 : 190,641 = 77,724.81 : x
  2. Step 2: Convert to fraction form
    138,155.43/190,641 = 77,724.81/x
  3. Step 3: Cross multiply
    138,155.43x = 190,641 × 77,724.81
  4. Step 4: Simplify right side
    138,155.43x = 14,817,535,503.21
  5. Step 5: Solve for x
    x = 14,817,535,503.21/138,155.43
  6. Step 6: Final answer
    x = 107,252.65

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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.