Home / 138,929.28-208,143.36-85,528.32

Finding the Fourth Proportional to 138,929.28, 208,143.36 and 85,528.32

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Solution

The fourth proportional to 138,929.28, 208,143.36 and 85,528.32 is: 128,138.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,929.28 : 208,143.36 = 85,528.32 : x
  2. Step 2: Convert to fraction form
    138,929.28/208,143.36 = 85,528.32/x
  3. Step 3: Cross multiply
    138,929.28x = 208,143.36 × 85,528.32
  4. Step 4: Simplify right side
    138,929.28x = 17,802,151,899.96
  5. Step 5: Solve for x
    x = 17,802,151,899.96/138,929.28
  6. Step 6: Final answer
    x = 128,138.23

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.