Home / 100,819.07-139,114.04-57,790.65

Finding the Fourth Proportional to 100,819.07, 139,114.04 and 57,790.65

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Solution

The fourth proportional to 100,819.07, 139,114.04 and 57,790.65 is: 79,741.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,819.07 : 139,114.04 = 57,790.65 : x
  2. Step 2: Convert to fraction form
    100,819.07/139,114.04 = 57,790.65/x
  3. Step 3: Cross multiply
    100,819.07x = 139,114.04 × 57,790.65
  4. Step 4: Simplify right side
    100,819.07x = 8,039,490,506.77
  5. Step 5: Solve for x
    x = 8,039,490,506.77/100,819.07
  6. Step 6: Final answer
    x = 79,741.77

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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.