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Finding the Fourth Proportional to 18,970.65, 28,455.71 and 8,582.40

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Solution

The fourth proportional to 18,970.65, 28,455.71 and 8,582.40 is: 12,873.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,970.65 : 28,455.71 = 8,582.40 : x
  2. Step 2: Convert to fraction form
    18,970.65/28,455.71 = 8,582.40/x
  3. Step 3: Cross multiply
    18,970.65x = 28,455.71 × 8,582.40
  4. Step 4: Simplify right side
    18,970.65x = 244,218,242.59
  5. Step 5: Solve for x
    x = 244,218,242.59/18,970.65
  6. Step 6: Final answer
    x = 12,873.48

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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.