Home / 28,355.06-39,130.09-15,779.81

Finding the Fourth Proportional to 28,355.06, 39,130.09 and 15,779.81

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Solution

The fourth proportional to 28,355.06, 39,130.09 and 15,779.81 is: 21,776.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,355.06 : 39,130.09 = 15,779.81 : x
  2. Step 2: Convert to fraction form
    28,355.06/39,130.09 = 15,779.81/x
  3. Step 3: Cross multiply
    28,355.06x = 39,130.09 × 15,779.81
  4. Step 4: Simplify right side
    28,355.06x = 617,465,443.86
  5. Step 5: Solve for x
    x = 617,465,443.86/28,355.06
  6. Step 6: Final answer
    x = 21,776.20

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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.