Home / 13,778.21-19,012.65-7,810.40

Finding the Fourth Proportional to 13,778.21, 19,012.65 and 7,810.40

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Solution

The fourth proportional to 13,778.21, 19,012.65 and 7,810.40 is: 10,777.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,778.21 : 19,012.65 = 7,810.40 : x
  2. Step 2: Convert to fraction form
    13,778.21/19,012.65 = 7,810.40/x
  3. Step 3: Cross multiply
    13,778.21x = 19,012.65 × 7,810.40
  4. Step 4: Simplify right side
    13,778.21x = 148,496,401.56
  5. Step 5: Solve for x
    x = 148,496,401.56/13,778.21
  6. Step 6: Final answer
    x = 10,777.63

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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.