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Finding the Fourth Proportional to 18,948.30, 28,410.30 and 7,859.40

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Solution

The fourth proportional to 18,948.30, 28,410.30 and 7,859.40 is: 11,784.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,948.30 : 28,410.30 = 7,859.40 : x
  2. Step 2: Convert to fraction form
    18,948.30/28,410.30 = 7,859.40/x
  3. Step 3: Cross multiply
    18,948.30x = 28,410.30 × 7,859.40
  4. Step 4: Simplify right side
    18,948.30x = 223,287,911.82
  5. Step 5: Solve for x
    x = 223,287,911.82/18,948.30
  6. Step 6: Final answer
    x = 11,784.06

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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.