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Finding the Fourth Proportional to 207,136.80, 310,705.20 and 128,404.80

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Solution

The fourth proportional to 207,136.80, 310,705.20 and 128,404.80 is: 192,607.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,136.80 : 310,705.20 = 128,404.80 : x
  2. Step 2: Convert to fraction form
    207,136.80/310,705.20 = 128,404.80/x
  3. Step 3: Cross multiply
    207,136.80x = 310,705.20 × 128,404.80
  4. Step 4: Simplify right side
    207,136.80x = 39,896,039,064.96
  5. Step 5: Solve for x
    x = 39,896,039,064.96/207,136.80
  6. Step 6: Final answer
    x = 192,607.20

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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.