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Finding the Fourth Proportional to 8,688.61, 11,990.33 and 4,709.71

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Solution

The fourth proportional to 8,688.61, 11,990.33 and 4,709.71 is: 6,499.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,688.61 : 11,990.33 = 4,709.71 : x
  2. Step 2: Convert to fraction form
    8,688.61/11,990.33 = 4,709.71/x
  3. Step 3: Cross multiply
    8,688.61x = 11,990.33 × 4,709.71
  4. Step 4: Simplify right side
    8,688.61x = 56,470,977.10
  5. Step 5: Solve for x
    x = 56,470,977.10/8,688.61
  6. Step 6: Final answer
    x = 6,499.43

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.