Home / 280,807.13-421,127.50-81,129.31

Finding the Fourth Proportional to 280,807.13, 421,127.50 and 81,129.31

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Solution

The fourth proportional to 280,807.13, 421,127.50 and 81,129.31 is: 121,669.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,807.13 : 421,127.50 = 81,129.31 : x
  2. Step 2: Convert to fraction form
    280,807.13/421,127.50 = 81,129.31/x
  3. Step 3: Cross multiply
    280,807.13x = 421,127.50 × 81,129.31
  4. Step 4: Simplify right side
    280,807.13x = 34,165,783,497.03
  5. Step 5: Solve for x
    x = 34,165,783,497.03/280,807.13
  6. Step 6: Final answer
    x = 121,669.93

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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.