Home / 19,780.48-29,669.95-4,989.21

Finding the Fourth Proportional to 19,780.48, 29,669.95 and 4,989.21

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Solution

The fourth proportional to 19,780.48, 29,669.95 and 4,989.21 is: 7,483.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,780.48 : 29,669.95 = 4,989.21 : x
  2. Step 2: Convert to fraction form
    19,780.48/29,669.95 = 4,989.21/x
  3. Step 3: Cross multiply
    19,780.48x = 29,669.95 × 4,989.21
  4. Step 4: Simplify right side
    19,780.48x = 148,029,611.24
  5. Step 5: Solve for x
    x = 148,029,611.24/19,780.48
  6. Step 6: Final answer
    x = 7,483.62

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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.