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Finding the Fourth Proportional to 4,947, 7,421.58 and 1,869

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Solution

The fourth proportional to 4,947, 7,421.58 and 1,869 is: 2,803.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,947 : 7,421.58 = 1,869 : x
  2. Step 2: Convert to fraction form
    4,947/7,421.58 = 1,869/x
  3. Step 3: Cross multiply
    4,947x = 7,421.58 × 1,869
  4. Step 4: Simplify right side
    4,947x = 13,870,933.02
  5. Step 5: Solve for x
    x = 13,870,933.02/4,947
  6. Step 6: Final answer
    x = 2,803.91

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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.