Home / 81,145.10-121,746.81-71,405.66

Finding the Fourth Proportional to 81,145.10, 121,746.81 and 71,405.66

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Solution

The fourth proportional to 81,145.10, 121,746.81 and 71,405.66 is: 107,134.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,145.10 : 121,746.81 = 71,405.66 : x
  2. Step 2: Convert to fraction form
    81,145.10/121,746.81 = 71,405.66/x
  3. Step 3: Cross multiply
    81,145.10x = 121,746.81 × 71,405.66
  4. Step 4: Simplify right side
    81,145.10x = 8,693,411,320.94
  5. Step 5: Solve for x
    x = 8,693,411,320.94/81,145.10
  6. Step 6: Final answer
    x = 107,134.15

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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.