Home / 21,315.40-31,970.30-6,525.80

Finding the Fourth Proportional to 21,315.40, 31,970.30 and 6,525.80

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Solution

The fourth proportional to 21,315.40, 31,970.30 and 6,525.80 is: 9,787.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,315.40 : 31,970.30 = 6,525.80 : x
  2. Step 2: Convert to fraction form
    21,315.40/31,970.30 = 6,525.80/x
  3. Step 3: Cross multiply
    21,315.40x = 31,970.30 × 6,525.80
  4. Step 4: Simplify right side
    21,315.40x = 208,631,783.74
  5. Step 5: Solve for x
    x = 208,631,783.74/21,315.40
  6. Step 6: Final answer
    x = 9,787.84

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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.