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Finding the Fourth Proportional to 72,420.20, 108,630.30 and 19,829.60

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Solution

The fourth proportional to 72,420.20, 108,630.30 and 19,829.60 is: 29,744.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,420.20 : 108,630.30 = 19,829.60 : x
  2. Step 2: Convert to fraction form
    72,420.20/108,630.30 = 19,829.60/x
  3. Step 3: Cross multiply
    72,420.20x = 108,630.30 × 19,829.60
  4. Step 4: Simplify right side
    72,420.20x = 2,154,095,396.88
  5. Step 5: Solve for x
    x = 2,154,095,396.88/72,420.20
  6. Step 6: Final answer
    x = 29,744.40

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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.