Home / 15,353.80-21,190.10-8,639.68

Finding the Fourth Proportional to 15,353.80, 21,190.10 and 8,639.68

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Solution

The fourth proportional to 15,353.80, 21,190.10 and 8,639.68 is: 11,923.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,353.80 : 21,190.10 = 8,639.68 : x
  2. Step 2: Convert to fraction form
    15,353.80/21,190.10 = 8,639.68/x
  3. Step 3: Cross multiply
    15,353.80x = 21,190.10 × 8,639.68
  4. Step 4: Simplify right side
    15,353.80x = 183,075,683.17
  5. Step 5: Solve for x
    x = 183,075,683.17/15,353.80
  6. Step 6: Final answer
    x = 11,923.80

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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.