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Finding the Fourth Proportional to 18,905.30, 28,345.80 and 7,816.40

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Solution

The fourth proportional to 18,905.30, 28,345.80 and 7,816.40 is: 11,719.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,905.30 : 28,345.80 = 7,816.40 : x
  2. Step 2: Convert to fraction form
    18,905.30/28,345.80 = 7,816.40/x
  3. Step 3: Cross multiply
    18,905.30x = 28,345.80 × 7,816.40
  4. Step 4: Simplify right side
    18,905.30x = 221,562,111.12
  5. Step 5: Solve for x
    x = 221,562,111.12/18,905.30
  6. Step 6: Final answer
    x = 11,719.58

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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.