Home / 13,136.40-18,126.78-7,830.18

Finding the Fourth Proportional to 13,136.40, 18,126.78 and 7,830.18

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Solution

The fourth proportional to 13,136.40, 18,126.78 and 7,830.18 is: 10,804.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,136.40 : 18,126.78 = 7,830.18 : x
  2. Step 2: Convert to fraction form
    13,136.40/18,126.78 = 7,830.18/x
  3. Step 3: Cross multiply
    13,136.40x = 18,126.78 × 7,830.18
  4. Step 4: Simplify right side
    13,136.40x = 141,935,950.22
  5. Step 5: Solve for x
    x = 141,935,950.22/13,136.40
  6. Step 6: Final answer
    x = 10,804.78

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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.