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Finding the Fourth Proportional to 70,397.40, 105,612.68 and 20,478.60

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Solution

The fourth proportional to 70,397.40, 105,612.68 and 20,478.60 is: 30,722.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,397.40 : 105,612.68 = 20,478.60 : x
  2. Step 2: Convert to fraction form
    70,397.40/105,612.68 = 20,478.60/x
  3. Step 3: Cross multiply
    70,397.40x = 105,612.68 × 20,478.60
  4. Step 4: Simplify right side
    70,397.40x = 2,162,799,828.65
  5. Step 5: Solve for x
    x = 2,162,799,828.65/70,397.40
  6. Step 6: Final answer
    x = 30,722.72

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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.