Home / 21,012.48-31,519.80-5,430.24

Finding the Fourth Proportional to 21,012.48, 31,519.80 and 5,430.24

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Solution

The fourth proportional to 21,012.48, 31,519.80 and 5,430.24 is: 8,145.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,012.48 : 31,519.80 = 5,430.24 : x
  2. Step 2: Convert to fraction form
    21,012.48/31,519.80 = 5,430.24/x
  3. Step 3: Cross multiply
    21,012.48x = 31,519.80 × 5,430.24
  4. Step 4: Simplify right side
    21,012.48x = 171,160,078.75
  5. Step 5: Solve for x
    x = 171,160,078.75/21,012.48
  6. Step 6: Final answer
    x = 8,145.64

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.