Home / 28,312.45-42,428.37-20,858.29

Finding the Fourth Proportional to 28,312.45, 42,428.37 and 20,858.29

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Solution

The fourth proportional to 28,312.45, 42,428.37 and 20,858.29 is: 31,257.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,312.45 : 42,428.37 = 20,858.29 : x
  2. Step 2: Convert to fraction form
    28,312.45/42,428.37 = 20,858.29/x
  3. Step 3: Cross multiply
    28,312.45x = 42,428.37 × 20,858.29
  4. Step 4: Simplify right side
    28,312.45x = 884,983,245.69
  5. Step 5: Solve for x
    x = 884,983,245.69/28,312.45
  6. Step 6: Final answer
    x = 31,257.74

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.