Home / 280,243,859.20-420,405,964.80-86,171,574.40

Finding the Fourth Proportional to 280,243,859.20, 420,405,964.80 and 86,171,574.40

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Solution

The fourth proportional to 280,243,859.20, 420,405,964.80 and 86,171,574.40 is: 129,269,715.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,243,859.20 : 420,405,964.80 = 86,171,574.40 : x
  2. Step 2: Convert to fraction form
    280,243,859.20/420,405,964.80 = 86,171,574.40/x
  3. Step 3: Cross multiply
    280,243,859.20x = 420,405,964.80 × 86,171,574.40
  4. Step 4: Simplify right side
    280,243,859.20x = 36,227,043,873,966,984
  5. Step 5: Solve for x
    x = 36,227,043,873,966,984/280,243,859.20
  6. Step 6: Final answer
    x = 129,269,715.23

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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.