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Finding the Fourth Proportional to 70,286.80, 105,430.20 and 67,176.40

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Solution

The fourth proportional to 70,286.80, 105,430.20 and 67,176.40 is: 100,764.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,286.80 : 105,430.20 = 67,176.40 : x
  2. Step 2: Convert to fraction form
    70,286.80/105,430.20 = 67,176.40/x
  3. Step 3: Cross multiply
    70,286.80x = 105,430.20 × 67,176.40
  4. Step 4: Simplify right side
    70,286.80x = 7,082,421,287.28
  5. Step 5: Solve for x
    x = 7,082,421,287.28/70,286.80
  6. Step 6: Final answer
    x = 100,764.60

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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.