Home / 13,129.50-18,118.71-8,420.16

Finding the Fourth Proportional to 13,129.50, 18,118.71 and 8,420.16

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Solution

The fourth proportional to 13,129.50, 18,118.71 and 8,420.16 is: 11,619.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,129.50 : 18,118.71 = 8,420.16 : x
  2. Step 2: Convert to fraction form
    13,129.50/18,118.71 = 8,420.16/x
  3. Step 3: Cross multiply
    13,129.50x = 18,118.71 × 8,420.16
  4. Step 4: Simplify right side
    13,129.50x = 152,562,437.19
  5. Step 5: Solve for x
    x = 152,562,437.19/13,129.50
  6. Step 6: Final answer
    x = 11,619.82

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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.