Home / 21,320.40-31,977.80-6,530.80

Finding the Fourth Proportional to 21,320.40, 31,977.80 and 6,530.80

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Solution

The fourth proportional to 21,320.40, 31,977.80 and 6,530.80 is: 9,795.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,320.40 : 31,977.80 = 6,530.80 : x
  2. Step 2: Convert to fraction form
    21,320.40/31,977.80 = 6,530.80/x
  3. Step 3: Cross multiply
    21,320.40x = 31,977.80 × 6,530.80
  4. Step 4: Simplify right side
    21,320.40x = 208,840,616.24
  5. Step 5: Solve for x
    x = 208,840,616.24/21,320.40
  6. Step 6: Final answer
    x = 9,795.34

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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.