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Finding the Fourth Proportional to 30,121.99, 45,210.93 and 21,697.18

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Solution

The fourth proportional to 30,121.99, 45,210.93 and 21,697.18 is: 32,565.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,121.99 : 45,210.93 = 21,697.18 : x
  2. Step 2: Convert to fraction form
    30,121.99/45,210.93 = 21,697.18/x
  3. Step 3: Cross multiply
    30,121.99x = 45,210.93 × 21,697.18
  4. Step 4: Simplify right side
    30,121.99x = 980,949,573.15
  5. Step 5: Solve for x
    x = 980,949,573.15/30,121.99
  6. Step 6: Final answer
    x = 32,565.90

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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.