Home / 20,803.47-28,700.63-12,831.81

Finding the Fourth Proportional to 20,803.47, 28,700.63 and 12,831.81

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Solution

The fourth proportional to 20,803.47, 28,700.63 and 12,831.81 is: 17,702.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,803.47 : 28,700.63 = 12,831.81 : x
  2. Step 2: Convert to fraction form
    20,803.47/28,700.63 = 12,831.81/x
  3. Step 3: Cross multiply
    20,803.47x = 28,700.63 × 12,831.81
  4. Step 4: Simplify right side
    20,803.47x = 368,280,966.88
  5. Step 5: Solve for x
    x = 368,280,966.88/20,803.47
  6. Step 6: Final answer
    x = 17,702.86

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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.