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Finding the Fourth Proportional to 8,689.78, 11,991.86 and 4,710.89

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Solution

The fourth proportional to 8,689.78, 11,991.86 and 4,710.89 is: 6,501.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,689.78 : 11,991.86 = 4,710.89 : x
  2. Step 2: Convert to fraction form
    8,689.78/11,991.86 = 4,710.89/x
  3. Step 3: Cross multiply
    8,689.78x = 11,991.86 × 4,710.89
  4. Step 4: Simplify right side
    8,689.78x = 56,492,358.65
  5. Step 5: Solve for x
    x = 56,492,358.65/8,689.78
  6. Step 6: Final answer
    x = 6,501.01

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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.