Home / 21,038.40-31,581.90-12,727.80

Finding the Fourth Proportional to 21,038.40, 31,581.90 and 12,727.80

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Solution

The fourth proportional to 21,038.40, 31,581.90 and 12,727.80 is: 19,106.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,038.40 : 31,581.90 = 12,727.80 : x
  2. Step 2: Convert to fraction form
    21,038.40/31,581.90 = 12,727.80/x
  3. Step 3: Cross multiply
    21,038.40x = 31,581.90 × 12,727.80
  4. Step 4: Simplify right side
    21,038.40x = 401,968,106.82
  5. Step 5: Solve for x
    x = 401,968,106.82/21,038.40
  6. Step 6: Final answer
    x = 19,106.40

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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.