Home / 81,215.40-121,818.76-25,807.08

Finding the Fourth Proportional to 81,215.40, 121,818.76 and 25,807.08

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Solution

The fourth proportional to 81,215.40, 121,818.76 and 25,807.08 is: 38,709.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,215.40 : 121,818.76 = 25,807.08 : x
  2. Step 2: Convert to fraction form
    81,215.40/121,818.76 = 25,807.08/x
  3. Step 3: Cross multiply
    81,215.40x = 121,818.76 × 25,807.08
  4. Step 4: Simplify right side
    81,215.40x = 3,143,786,484.82
  5. Step 5: Solve for x
    x = 3,143,786,484.82/81,215.40
  6. Step 6: Final answer
    x = 38,709.24

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1.5x scale

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.