Home / 15,780.59-21,777.10-8,707.03

Finding the Fourth Proportional to 15,780.59, 21,777.10 and 8,707.03

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Solution

The fourth proportional to 15,780.59, 21,777.10 and 8,707.03 is: 12,015.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,780.59 : 21,777.10 = 8,707.03 : x
  2. Step 2: Convert to fraction form
    15,780.59/21,777.10 = 8,707.03/x
  3. Step 3: Cross multiply
    15,780.59x = 21,777.10 × 8,707.03
  4. Step 4: Simplify right side
    15,780.59x = 189,613,835.78
  5. Step 5: Solve for x
    x = 189,613,835.78/15,780.59
  6. Step 6: Final answer
    x = 12,015.64

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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.