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Finding the Fourth Proportional to 8,999.68, 12,420.14 and 5,021.40

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Solution

The fourth proportional to 8,999.68, 12,420.14 and 5,021.40 is: 6,929.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,999.68 : 12,420.14 = 5,021.40 : x
  2. Step 2: Convert to fraction form
    8,999.68/12,420.14 = 5,021.40/x
  3. Step 3: Cross multiply
    8,999.68x = 12,420.14 × 5,021.40
  4. Step 4: Simplify right side
    8,999.68x = 62,366,491.00
  5. Step 5: Solve for x
    x = 62,366,491.00/8,999.68
  6. Step 6: Final answer
    x = 6,929.86

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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.