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Finding the Fourth Proportional to 28,407.90, 42,611.84 and 8,686.46

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Solution

The fourth proportional to 28,407.90, 42,611.84 and 8,686.46 is: 13,029.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,407.90 : 42,611.84 = 8,686.46 : x
  2. Step 2: Convert to fraction form
    28,407.90/42,611.84 = 8,686.46/x
  3. Step 3: Cross multiply
    28,407.90x = 42,611.84 × 8,686.46
  4. Step 4: Simplify right side
    28,407.90x = 370,145,852.34
  5. Step 5: Solve for x
    x = 370,145,852.34/28,407.90
  6. Step 6: Final answer
    x = 13,029.68

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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.