Home / 100,979.85-139,352.86-57,947.86

Finding the Fourth Proportional to 100,979.85, 139,352.86 and 57,947.86

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Solution

The fourth proportional to 100,979.85, 139,352.86 and 57,947.86 is: 79,968.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,979.85 : 139,352.86 = 57,947.86 : x
  2. Step 2: Convert to fraction form
    100,979.85/139,352.86 = 57,947.86/x
  3. Step 3: Cross multiply
    100,979.85x = 139,352.86 × 57,947.86
  4. Step 4: Simplify right side
    100,979.85x = 8,075,199,035.38
  5. Step 5: Solve for x
    x = 8,075,199,035.38/100,979.85
  6. Step 6: Final answer
    x = 79,968.42

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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.