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Finding the Fourth Proportional to 28,554.60, 42,820.84 and 9,831.08

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Solution

The fourth proportional to 28,554.60, 42,820.84 and 9,831.08 is: 14,742.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,554.60 : 42,820.84 = 9,831.08 : x
  2. Step 2: Convert to fraction form
    28,554.60/42,820.84 = 9,831.08/x
  3. Step 3: Cross multiply
    28,554.60x = 42,820.84 × 9,831.08
  4. Step 4: Simplify right side
    28,554.60x = 420,975,103.71
  5. Step 5: Solve for x
    x = 420,975,103.71/28,554.60
  6. Step 6: Final answer
    x = 14,742.81

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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.