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Finding the Fourth Proportional to 8,911.86, 13,368.48 and 2,988.78

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Solution

The fourth proportional to 8,911.86, 13,368.48 and 2,988.78 is: 4,483.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,911.86 : 13,368.48 = 2,988.78 : x
  2. Step 2: Convert to fraction form
    8,911.86/13,368.48 = 2,988.78/x
  3. Step 3: Cross multiply
    8,911.86x = 13,368.48 × 2,988.78
  4. Step 4: Simplify right side
    8,911.86x = 39,955,445.65
  5. Step 5: Solve for x
    x = 39,955,445.65/8,911.86
  6. Step 6: Final answer
    x = 4,483.40

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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.