Home / 13,486.16-20,129.38-12,655.10

Finding the Fourth Proportional to 13,486.16, 20,129.38 and 12,655.10

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Solution

The fourth proportional to 13,486.16, 20,129.38 and 12,655.10 is: 18,888.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,486.16 : 20,129.38 = 12,655.10 : x
  2. Step 2: Convert to fraction form
    13,486.16/20,129.38 = 12,655.10/x
  3. Step 3: Cross multiply
    13,486.16x = 20,129.38 × 12,655.10
  4. Step 4: Simplify right side
    13,486.16x = 254,739,316.84
  5. Step 5: Solve for x
    x = 254,739,316.84/13,486.16
  6. Step 6: Final answer
    x = 18,888.94

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.