Home / 28,579.20-39,430.14-18,515.40

Finding the Fourth Proportional to 28,579.20, 39,430.14 and 18,515.40

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Solution

The fourth proportional to 28,579.20, 39,430.14 and 18,515.40 is: 25,545.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,579.20 : 39,430.14 = 18,515.40 : x
  2. Step 2: Convert to fraction form
    28,579.20/39,430.14 = 18,515.40/x
  3. Step 3: Cross multiply
    28,579.20x = 39,430.14 × 18,515.40
  4. Step 4: Simplify right side
    28,579.20x = 730,064,814.16
  5. Step 5: Solve for x
    x = 730,064,814.16/28,579.20
  6. Step 6: Final answer
    x = 25,545.32

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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.