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Finding the Fourth Proportional to 72,405.80, 108,608.70 and 42,808.40

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Solution

The fourth proportional to 72,405.80, 108,608.70 and 42,808.40 is: 64,212.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,405.80 : 108,608.70 = 42,808.40 : x
  2. Step 2: Convert to fraction form
    72,405.80/108,608.70 = 42,808.40/x
  3. Step 3: Cross multiply
    72,405.80x = 108,608.70 × 42,808.40
  4. Step 4: Simplify right side
    72,405.80x = 4,649,364,673.08
  5. Step 5: Solve for x
    x = 4,649,364,673.08/72,405.80
  6. Step 6: Final answer
    x = 64,212.60

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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.