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Finding the Fourth Proportional to 14,389.61, 19,859.00 and 8,420.90

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Solution

The fourth proportional to 14,389.61, 19,859.00 and 8,420.90 is: 11,621.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,389.61 : 19,859.00 = 8,420.90 : x
  2. Step 2: Convert to fraction form
    14,389.61/19,859.00 = 8,420.90/x
  3. Step 3: Cross multiply
    14,389.61x = 19,859.00 × 8,420.90
  4. Step 4: Simplify right side
    14,389.61x = 167,230,511.70
  5. Step 5: Solve for x
    x = 167,230,511.70/14,389.61
  6. Step 6: Final answer
    x = 11,621.62

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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.