Home / 28,530.36-39,369.96-15,783.12

Finding the Fourth Proportional to 28,530.36, 39,369.96 and 15,783.12

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Solution

The fourth proportional to 28,530.36, 39,369.96 and 15,783.12 is: 21,779.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,530.36 : 39,369.96 = 15,783.12 : x
  2. Step 2: Convert to fraction form
    28,530.36/39,369.96 = 15,783.12/x
  3. Step 3: Cross multiply
    28,530.36x = 39,369.96 × 15,783.12
  4. Step 4: Simplify right side
    28,530.36x = 621,380,803.08
  5. Step 5: Solve for x
    x = 621,380,803.08/28,530.36
  6. Step 6: Final answer
    x = 21,779.63

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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.