Home / 21,153.46-31,695.58-12,808.20

Finding the Fourth Proportional to 21,153.46, 31,695.58 and 12,808.20

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Solution

The fourth proportional to 21,153.46, 31,695.58 and 12,808.20 is: 19,191.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,153.46 : 31,695.58 = 12,808.20 : x
  2. Step 2: Convert to fraction form
    21,153.46/31,695.58 = 12,808.20/x
  3. Step 3: Cross multiply
    21,153.46x = 31,695.58 × 12,808.20
  4. Step 4: Simplify right side
    21,153.46x = 405,963,263.72
  5. Step 5: Solve for x
    x = 405,963,263.72/21,153.46
  6. Step 6: Final answer
    x = 19,191.34

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1.5x scale

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.