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Finding the Fourth Proportional to 84,309.84, 126,368.76 and 28,136.76

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Solution

The fourth proportional to 84,309.84, 126,368.76 and 28,136.76 is: 42,173.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,309.84 : 126,368.76 = 28,136.76 : x
  2. Step 2: Convert to fraction form
    84,309.84/126,368.76 = 28,136.76/x
  3. Step 3: Cross multiply
    84,309.84x = 126,368.76 × 28,136.76
  4. Step 4: Simplify right side
    84,309.84x = 3,555,607,471.62
  5. Step 5: Solve for x
    x = 3,555,607,471.62/84,309.84
  6. Step 6: Final answer
    x = 42,173.10

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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.