Home / 15,529.80-21,430.40-8,456.20

Finding the Fourth Proportional to 15,529.80, 21,430.40 and 8,456.20

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Solution

The fourth proportional to 15,529.80, 21,430.40 and 8,456.20 is: 11,669.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,529.80 : 21,430.40 = 8,456.20 : x
  2. Step 2: Convert to fraction form
    15,529.80/21,430.40 = 8,456.20/x
  3. Step 3: Cross multiply
    15,529.80x = 21,430.40 × 8,456.20
  4. Step 4: Simplify right side
    15,529.80x = 181,219,748.48
  5. Step 5: Solve for x
    x = 181,219,748.48/15,529.80
  6. Step 6: Final answer
    x = 11,669.16

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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.