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Finding the Fourth Proportional to 70,412.80, 105,619.20 and 45,529.60

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Solution

The fourth proportional to 70,412.80, 105,619.20 and 45,529.60 is: 68,294.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,412.80 : 105,619.20 = 45,529.60 : x
  2. Step 2: Convert to fraction form
    70,412.80/105,619.20 = 45,529.60/x
  3. Step 3: Cross multiply
    70,412.80x = 105,619.20 × 45,529.60
  4. Step 4: Simplify right side
    70,412.80x = 4,808,799,928.32
  5. Step 5: Solve for x
    x = 4,808,799,928.32/70,412.80
  6. Step 6: Final answer
    x = 68,294.40

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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.