Home / 15,528.80-21,429.60-8,455.20

Finding the Fourth Proportional to 15,528.80, 21,429.60 and 8,455.20

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Solution

The fourth proportional to 15,528.80, 21,429.60 and 8,455.20 is: 11,668.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,528.80 : 21,429.60 = 8,455.20 : x
  2. Step 2: Convert to fraction form
    15,528.80/21,429.60 = 8,455.20/x
  3. Step 3: Cross multiply
    15,528.80x = 21,429.60 × 8,455.20
  4. Step 4: Simplify right side
    15,528.80x = 181,191,553.92
  5. Step 5: Solve for x
    x = 181,191,553.92/15,528.80
  6. Step 6: Final answer
    x = 11,668.10

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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.