Home / 15,420.15-21,280.19-8,705.90

Finding the Fourth Proportional to 15,420.15, 21,280.19 and 8,705.90

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Solution

The fourth proportional to 15,420.15, 21,280.19 and 8,705.90 is: 12,014.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,420.15 : 21,280.19 = 8,705.90 : x
  2. Step 2: Convert to fraction form
    15,420.15/21,280.19 = 8,705.90/x
  3. Step 3: Cross multiply
    15,420.15x = 21,280.19 × 8,705.90
  4. Step 4: Simplify right side
    15,420.15x = 185,263,215.79
  5. Step 5: Solve for x
    x = 185,263,215.79/15,420.15
  6. Step 6: Final answer
    x = 12,014.36

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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.