Home / 28,355.12-39,129.40-15,779.60

Finding the Fourth Proportional to 28,355.12, 39,129.40 and 15,779.60

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Solution

The fourth proportional to 28,355.12, 39,129.40 and 15,779.60 is: 21,775.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,355.12 : 39,129.40 = 15,779.60 : x
  2. Step 2: Convert to fraction form
    28,355.12/39,129.40 = 15,779.60/x
  3. Step 3: Cross multiply
    28,355.12x = 39,129.40 × 15,779.60
  4. Step 4: Simplify right side
    28,355.12x = 617,446,280.24
  5. Step 5: Solve for x
    x = 617,446,280.24/28,355.12
  6. Step 6: Final answer
    x = 21,775.48

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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.