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Finding the Fourth Proportional to 30,321.75, 45,427.21 and 21,981.08

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Solution

The fourth proportional to 30,321.75, 45,427.21 and 21,981.08 is: 32,931.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,321.75 : 45,427.21 = 21,981.08 : x
  2. Step 2: Convert to fraction form
    30,321.75/45,427.21 = 21,981.08/x
  3. Step 3: Cross multiply
    30,321.75x = 45,427.21 × 21,981.08
  4. Step 4: Simplify right side
    30,321.75x = 998,539,137.19
  5. Step 5: Solve for x
    x = 998,539,137.19/30,321.75
  6. Step 6: Final answer
    x = 32,931.45

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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.