Home / 21,205.16-31,811.40-7,165.30

Finding the Fourth Proportional to 21,205.16, 31,811.40 and 7,165.30

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Solution

The fourth proportional to 21,205.16, 31,811.40 and 7,165.30 is: 10,749.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,205.16 : 31,811.40 = 7,165.30 : x
  2. Step 2: Convert to fraction form
    21,205.16/31,811.40 = 7,165.30/x
  3. Step 3: Cross multiply
    21,205.16x = 31,811.40 × 7,165.30
  4. Step 4: Simplify right side
    21,205.16x = 227,938,224.42
  5. Step 5: Solve for x
    x = 227,938,224.42/21,205.16
  6. Step 6: Final answer
    x = 10,749.19

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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.