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Finding the Fourth Proportional to 70,220.94, 105,315.99 and 20,290.17

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Solution

The fourth proportional to 70,220.94, 105,315.99 and 20,290.17 is: 30,430.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,220.94 : 105,315.99 = 20,290.17 : x
  2. Step 2: Convert to fraction form
    70,220.94/105,315.99 = 20,290.17/x
  3. Step 3: Cross multiply
    70,220.94x = 105,315.99 × 20,290.17
  4. Step 4: Simplify right side
    70,220.94x = 2,136,879,340.82
  5. Step 5: Solve for x
    x = 2,136,879,340.82/70,220.94
  6. Step 6: Final answer
    x = 30,430.80

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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.