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Finding the Fourth Proportional to 21,903.80, 32,831.40 and 9,421.70

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Solution

The fourth proportional to 21,903.80, 32,831.40 and 9,421.70 is: 14,122.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,903.80 : 32,831.40 = 9,421.70 : x
  2. Step 2: Convert to fraction form
    21,903.80/32,831.40 = 9,421.70/x
  3. Step 3: Cross multiply
    21,903.80x = 32,831.40 × 9,421.70
  4. Step 4: Simplify right side
    21,903.80x = 309,327,601.38
  5. Step 5: Solve for x
    x = 309,327,601.38/21,903.80
  6. Step 6: Final answer
    x = 14,122.10

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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.