Home / 13,130.15-18,116.37-8,420.81

Finding the Fourth Proportional to 13,130.15, 18,116.37 and 8,420.81

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Solution

The fourth proportional to 13,130.15, 18,116.37 and 8,420.81 is: 11,618.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,130.15 : 18,116.37 = 8,420.81 : x
  2. Step 2: Convert to fraction form
    13,130.15/18,116.37 = 8,420.81/x
  3. Step 3: Cross multiply
    13,130.15x = 18,116.37 × 8,420.81
  4. Step 4: Simplify right side
    13,130.15x = 152,554,419.08
  5. Step 5: Solve for x
    x = 152,554,419.08/13,130.15
  6. Step 6: Final answer
    x = 11,618.64

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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.