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Finding the Fourth Proportional to 30,708.90, 45,981.32 and 19,555.20

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Solution

The fourth proportional to 30,708.90, 45,981.32 and 19,555.20 is: 29,280.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,708.90 : 45,981.32 = 19,555.20 : x
  2. Step 2: Convert to fraction form
    30,708.90/45,981.32 = 19,555.20/x
  3. Step 3: Cross multiply
    30,708.90x = 45,981.32 × 19,555.20
  4. Step 4: Simplify right side
    30,708.90x = 899,173,811.09
  5. Step 5: Solve for x
    x = 899,173,811.09/30,708.90
  6. Step 6: Final answer
    x = 29,280.56

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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.