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Finding the Fourth Proportional to 28,420.41, 42,629.10 and 8,698.98

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Solution

The fourth proportional to 28,420.41, 42,629.10 and 8,698.98 is: 13,048.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,420.41 : 42,629.10 = 8,698.98 : x
  2. Step 2: Convert to fraction form
    28,420.41/42,629.10 = 8,698.98/x
  3. Step 3: Cross multiply
    28,420.41x = 42,629.10 × 8,698.98
  4. Step 4: Simplify right side
    28,420.41x = 370,829,688.32
  5. Step 5: Solve for x
    x = 370,829,688.32/28,420.41
  6. Step 6: Final answer
    x = 13,048.01

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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.