Home / 81,111.48-121,668-28,521.40

Finding the Fourth Proportional to 81,111.48, 121,668 and 28,521.40

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Solution

The fourth proportional to 81,111.48, 121,668 and 28,521.40 is: 42,782.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,111.48 : 121,668 = 28,521.40 : x
  2. Step 2: Convert to fraction form
    81,111.48/121,668 = 28,521.40/x
  3. Step 3: Cross multiply
    81,111.48x = 121,668 × 28,521.40
  4. Step 4: Simplify right side
    81,111.48x = 3,470,141,695.20
  5. Step 5: Solve for x
    x = 3,470,141,695.20/81,111.48
  6. Step 6: Final answer
    x = 42,782.37

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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.