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Finding the Fourth Proportional to 1,886.65, 2,829.62 and 790.72

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Solution

The fourth proportional to 1,886.65, 2,829.62 and 790.72 is: 1,185.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,886.65 : 2,829.62 = 790.72 : x
  2. Step 2: Convert to fraction form
    1,886.65/2,829.62 = 790.72/x
  3. Step 3: Cross multiply
    1,886.65x = 2,829.62 × 790.72
  4. Step 4: Simplify right side
    1,886.65x = 2,237,432.03
  5. Step 5: Solve for x
    x = 2,237,432.03/1,886.65
  6. Step 6: Final answer
    x = 1,185.93

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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.