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Finding the Fourth Proportional to 8,989.76, 13,386.71 and 8,891.50

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Solution

The fourth proportional to 8,989.76, 13,386.71 and 8,891.50 is: 13,240.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,989.76 : 13,386.71 = 8,891.50 : x
  2. Step 2: Convert to fraction form
    8,989.76/13,386.71 = 8,891.50/x
  3. Step 3: Cross multiply
    8,989.76x = 13,386.71 × 8,891.50
  4. Step 4: Simplify right side
    8,989.76x = 119,027,820.57
  5. Step 5: Solve for x
    x = 119,027,820.57/8,989.76
  6. Step 6: Final answer
    x = 13,240.39

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.