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Finding the Fourth Proportional to 8,989.68, 12,405.78 and 5,011.59

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Solution

The fourth proportional to 8,989.68, 12,405.78 and 5,011.59 is: 6,916.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,989.68 : 12,405.78 = 5,011.59 : x
  2. Step 2: Convert to fraction form
    8,989.68/12,405.78 = 5,011.59/x
  3. Step 3: Cross multiply
    8,989.68x = 12,405.78 × 5,011.59
  4. Step 4: Simplify right side
    8,989.68x = 62,172,682.99
  5. Step 5: Solve for x
    x = 62,172,682.99/8,989.68
  6. Step 6: Final answer
    x = 6,916.01

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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.