Home / 20,510.40-28,303.20-12,129.60

Finding the Fourth Proportional to 20,510.40, 28,303.20 and 12,129.60

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Solution

The fourth proportional to 20,510.40, 28,303.20 and 12,129.60 is: 16,738.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,510.40 : 28,303.20 = 12,129.60 : x
  2. Step 2: Convert to fraction form
    20,510.40/28,303.20 = 12,129.60/x
  3. Step 3: Cross multiply
    20,510.40x = 28,303.20 × 12,129.60
  4. Step 4: Simplify right side
    20,510.40x = 343,306,494.72
  5. Step 5: Solve for x
    x = 343,306,494.72/20,510.40
  6. Step 6: Final answer
    x = 16,738.17

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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.