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Finding the Fourth Proportional to 389,885.51, 538,011.98 and 220,136.39

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Solution

The fourth proportional to 389,885.51, 538,011.98 and 220,136.39 is: 303,771.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,885.51 : 538,011.98 = 220,136.39 : x
  2. Step 2: Convert to fraction form
    389,885.51/538,011.98 = 220,136.39/x
  3. Step 3: Cross multiply
    389,885.51x = 538,011.98 × 220,136.39
  4. Step 4: Simplify right side
    389,885.51x = 118,436,013,953.27
  5. Step 5: Solve for x
    x = 118,436,013,953.27/389,885.51
  6. Step 6: Final answer
    x = 303,771.26

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.