Home / 20,318.58-28,075.68-15,643.26

Finding the Fourth Proportional to 20,318.58, 28,075.68 and 15,643.26

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Solution

The fourth proportional to 20,318.58, 28,075.68 and 15,643.26 is: 21,615.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,318.58 : 28,075.68 = 15,643.26 : x
  2. Step 2: Convert to fraction form
    20,318.58/28,075.68 = 15,643.26/x
  3. Step 3: Cross multiply
    20,318.58x = 28,075.68 × 15,643.26
  4. Step 4: Simplify right side
    20,318.58x = 439,195,161.92
  5. Step 5: Solve for x
    x = 439,195,161.92/20,318.58
  6. Step 6: Final answer
    x = 21,615.45

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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.