Home / 20,530.90-28,332.67-11,578.37

Finding the Fourth Proportional to 20,530.90, 28,332.67 and 11,578.37

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Solution

The fourth proportional to 20,530.90, 28,332.67 and 11,578.37 is: 15,978.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,530.90 : 28,332.67 = 11,578.37 : x
  2. Step 2: Convert to fraction form
    20,530.90/28,332.67 = 11,578.37/x
  3. Step 3: Cross multiply
    20,530.90x = 28,332.67 × 11,578.37
  4. Step 4: Simplify right side
    20,530.90x = 328,046,136.35
  5. Step 5: Solve for x
    x = 328,046,136.35/20,530.90
  6. Step 6: Final answer
    x = 15,978.17

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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.