Home / 13,430.09-20,117.70-6,388.80

Finding the Fourth Proportional to 13,430.09, 20,117.70 and 6,388.80

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Solution

The fourth proportional to 13,430.09, 20,117.70 and 6,388.80 is: 9,570.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,430.09 : 20,117.70 = 6,388.80 : x
  2. Step 2: Convert to fraction form
    13,430.09/20,117.70 = 6,388.80/x
  3. Step 3: Cross multiply
    13,430.09x = 20,117.70 × 6,388.80
  4. Step 4: Simplify right side
    13,430.09x = 128,527,961.76
  5. Step 5: Solve for x
    x = 128,527,961.76/13,430.09
  6. Step 6: Final answer
    x = 9,570.15

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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.