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Finding the Fourth Proportional to 28,123.94, 38,811.04 and 15,377.13

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Solution

The fourth proportional to 28,123.94, 38,811.04 and 15,377.13 is: 21,220.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,123.94 : 38,811.04 = 15,377.13 : x
  2. Step 2: Convert to fraction form
    28,123.94/38,811.04 = 15,377.13/x
  3. Step 3: Cross multiply
    28,123.94x = 38,811.04 × 15,377.13
  4. Step 4: Simplify right side
    28,123.94x = 596,802,543.10
  5. Step 5: Solve for x
    x = 596,802,543.10/28,123.94
  6. Step 6: Final answer
    x = 21,220.44

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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.