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Finding the Fourth Proportional to 72,990.60, 109,477.80 and 20,405.40

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Solution

The fourth proportional to 72,990.60, 109,477.80 and 20,405.40 is: 30,605.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,990.60 : 109,477.80 = 20,405.40 : x
  2. Step 2: Convert to fraction form
    72,990.60/109,477.80 = 20,405.40/x
  3. Step 3: Cross multiply
    72,990.60x = 109,477.80 × 20,405.40
  4. Step 4: Simplify right side
    72,990.60x = 2,233,938,300.12
  5. Step 5: Solve for x
    x = 2,233,938,300.12/72,990.60
  6. Step 6: Final answer
    x = 30,605.84

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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.