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Finding the Fourth Proportional to 28,900.80, 39,916.80 and 19,454.40

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Solution

The fourth proportional to 28,900.80, 39,916.80 and 19,454.40 is: 26,869.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,900.80 : 39,916.80 = 19,454.40 : x
  2. Step 2: Convert to fraction form
    28,900.80/39,916.80 = 19,454.40/x
  3. Step 3: Cross multiply
    28,900.80x = 39,916.80 × 19,454.40
  4. Step 4: Simplify right side
    28,900.80x = 776,557,393.92
  5. Step 5: Solve for x
    x = 776,557,393.92/28,900.80
  6. Step 6: Final answer
    x = 26,869.75

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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.