Home / 13,128.08-18,116.64-7,159.69

Finding the Fourth Proportional to 13,128.08, 18,116.64 and 7,159.69

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Solution

The fourth proportional to 13,128.08, 18,116.64 and 7,159.69 is: 9,880.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,128.08 : 18,116.64 = 7,159.69 : x
  2. Step 2: Convert to fraction form
    13,128.08/18,116.64 = 7,159.69/x
  3. Step 3: Cross multiply
    13,128.08x = 18,116.64 × 7,159.69
  4. Step 4: Simplify right side
    13,128.08x = 129,709,528.75
  5. Step 5: Solve for x
    x = 129,709,528.75/13,128.08
  6. Step 6: Final answer
    x = 9,880.32

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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.