Home / 56,620.89-78,136.38-30,779.28

Finding the Fourth Proportional to 56,620.89, 78,136.38 and 30,779.28

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Solution

The fourth proportional to 56,620.89, 78,136.38 and 30,779.28 is: 42,475.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,620.89 : 78,136.38 = 30,779.28 : x
  2. Step 2: Convert to fraction form
    56,620.89/78,136.38 = 30,779.28/x
  3. Step 3: Cross multiply
    56,620.89x = 78,136.38 × 30,779.28
  4. Step 4: Simplify right side
    56,620.89x = 2,404,981,518.21
  5. Step 5: Solve for x
    x = 2,404,981,518.21/56,620.89
  6. Step 6: Final answer
    x = 42,475.16

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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.