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Finding the Fourth Proportional to 10,421.80, 15,611.10 and 6,900.52

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Solution

The fourth proportional to 10,421.80, 15,611.10 and 6,900.52 is: 10,336.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,421.80 : 15,611.10 = 6,900.52 : x
  2. Step 2: Convert to fraction form
    10,421.80/15,611.10 = 6,900.52/x
  3. Step 3: Cross multiply
    10,421.80x = 15,611.10 × 6,900.52
  4. Step 4: Simplify right side
    10,421.80x = 107,724,707.77
  5. Step 5: Solve for x
    x = 107,724,707.77/10,421.80
  6. Step 6: Final answer
    x = 10,336.48

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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.