Home / 28,380.48-42,570.64-12,779.84

Finding the Fourth Proportional to 28,380.48, 42,570.64 and 12,779.84

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Solution

The fourth proportional to 28,380.48, 42,570.64 and 12,779.84 is: 19,169.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,380.48 : 42,570.64 = 12,779.84 : x
  2. Step 2: Convert to fraction form
    28,380.48/42,570.64 = 12,779.84/x
  3. Step 3: Cross multiply
    28,380.48x = 42,570.64 × 12,779.84
  4. Step 4: Simplify right side
    28,380.48x = 544,045,967.90
  5. Step 5: Solve for x
    x = 544,045,967.90/28,380.48
  6. Step 6: Final answer
    x = 19,169.72

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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.