Home / 15,420.99-21,279.93-8,706.90

Finding the Fourth Proportional to 15,420.99, 21,279.93 and 8,706.90

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Solution

The fourth proportional to 15,420.99, 21,279.93 and 8,706.90 is: 12,014.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,420.99 : 21,279.93 = 8,706.90 : x
  2. Step 2: Convert to fraction form
    15,420.99/21,279.93 = 8,706.90/x
  3. Step 3: Cross multiply
    15,420.99x = 21,279.93 × 8,706.90
  4. Step 4: Simplify right side
    15,420.99x = 185,282,222.52
  5. Step 5: Solve for x
    x = 185,282,222.52/15,420.99
  6. Step 6: Final answer
    x = 12,014.94

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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.