Home / 20,643.72-28,488.78-12,681.36

Finding the Fourth Proportional to 20,643.72, 28,488.78 and 12,681.36

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Solution

The fourth proportional to 20,643.72, 28,488.78 and 12,681.36 is: 17,500.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,643.72 : 28,488.78 = 12,681.36 : x
  2. Step 2: Convert to fraction form
    20,643.72/28,488.78 = 12,681.36/x
  3. Step 3: Cross multiply
    20,643.72x = 28,488.78 × 12,681.36
  4. Step 4: Simplify right side
    20,643.72x = 361,276,475.14
  5. Step 5: Solve for x
    x = 361,276,475.14/20,643.72
  6. Step 6: Final answer
    x = 17,500.55

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.