Home / 21,011.20-31,516.75-7,160.20

Finding the Fourth Proportional to 21,011.20, 31,516.75 and 7,160.20

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Solution

The fourth proportional to 21,011.20, 31,516.75 and 7,160.20 is: 10,740.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,011.20 : 31,516.75 = 7,160.20 : x
  2. Step 2: Convert to fraction form
    21,011.20/31,516.75 = 7,160.20/x
  3. Step 3: Cross multiply
    21,011.20x = 31,516.75 × 7,160.20
  4. Step 4: Simplify right side
    21,011.20x = 225,666,233.35
  5. Step 5: Solve for x
    x = 225,666,233.35/21,011.20
  6. Step 6: Final answer
    x = 10,740.28

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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.