Home / 15,420.07-21,279.54-8,705.55

Finding the Fourth Proportional to 15,420.07, 21,279.54 and 8,705.55

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Solution

The fourth proportional to 15,420.07, 21,279.54 and 8,705.55 is: 12,013.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,420.07 : 21,279.54 = 8,705.55 : x
  2. Step 2: Convert to fraction form
    15,420.07/21,279.54 = 8,705.55/x
  3. Step 3: Cross multiply
    15,420.07x = 21,279.54 × 8,705.55
  4. Step 4: Simplify right side
    15,420.07x = 185,250,099.45
  5. Step 5: Solve for x
    x = 185,250,099.45/15,420.07
  6. Step 6: Final answer
    x = 12,013.57

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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.