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Finding the Fourth Proportional to 70,280.80, 105,439.20 and 40,645.60

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Solution

The fourth proportional to 70,280.80, 105,439.20 and 40,645.60 is: 60,978.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,280.80 : 105,439.20 = 40,645.60 : x
  2. Step 2: Convert to fraction form
    70,280.80/105,439.20 = 40,645.60/x
  3. Step 3: Cross multiply
    70,280.80x = 105,439.20 × 40,645.60
  4. Step 4: Simplify right side
    70,280.80x = 4,285,639,547.52
  5. Step 5: Solve for x
    x = 4,285,639,547.52/70,280.80
  6. Step 6: Final answer
    x = 60,978.81

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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.