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Finding the Fourth Proportional to 5,869.86, 8,810.58 and 3,990

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Solution

The fourth proportional to 5,869.86, 8,810.58 and 3,990 is: 5,988.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,869.86 : 8,810.58 = 3,990 : x
  2. Step 2: Convert to fraction form
    5,869.86/8,810.58 = 3,990/x
  3. Step 3: Cross multiply
    5,869.86x = 8,810.58 × 3,990
  4. Step 4: Simplify right side
    5,869.86x = 35,154,214.20
  5. Step 5: Solve for x
    x = 35,154,214.20/5,869.86
  6. Step 6: Final answer
    x = 5,988.94

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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.