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Finding the Fourth Proportional to 18,886.80, 28,333.64 and 7,787.32

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Solution

The fourth proportional to 18,886.80, 28,333.64 and 7,787.32 is: 11,682.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,886.80 : 28,333.64 = 7,787.32 : x
  2. Step 2: Convert to fraction form
    18,886.80/28,333.64 = 7,787.32/x
  3. Step 3: Cross multiply
    18,886.80x = 28,333.64 × 7,787.32
  4. Step 4: Simplify right side
    18,886.80x = 220,643,082.51
  5. Step 5: Solve for x
    x = 220,643,082.51/18,886.80
  6. Step 6: Final answer
    x = 11,682.40

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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.