Home / 15,692.09-21,656.61-8,978.69

Finding the Fourth Proportional to 15,692.09, 21,656.61 and 8,978.69

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Solution

The fourth proportional to 15,692.09, 21,656.61 and 8,978.69 is: 12,391.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,692.09 : 21,656.61 = 8,978.69 : x
  2. Step 2: Convert to fraction form
    15,692.09/21,656.61 = 8,978.69/x
  3. Step 3: Cross multiply
    15,692.09x = 21,656.61 × 8,978.69
  4. Step 4: Simplify right side
    15,692.09x = 194,448,041.78
  5. Step 5: Solve for x
    x = 194,448,041.78/15,692.09
  6. Step 6: Final answer
    x = 12,391.47

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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.