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Finding the Fourth Proportional to 13,485.63, 20,215.98 and 6,897.30

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Solution

The fourth proportional to 13,485.63, 20,215.98 and 6,897.30 is: 10,339.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,485.63 : 20,215.98 = 6,897.30 : x
  2. Step 2: Convert to fraction form
    13,485.63/20,215.98 = 6,897.30/x
  3. Step 3: Cross multiply
    13,485.63x = 20,215.98 × 6,897.30
  4. Step 4: Simplify right side
    13,485.63x = 139,435,678.85
  5. Step 5: Solve for x
    x = 139,435,678.85/13,485.63
  6. Step 6: Final answer
    x = 10,339.57

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.