Home / 100,979.35-139,352.16-57,947.36

Finding the Fourth Proportional to 100,979.35, 139,352.16 and 57,947.36

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Solution

The fourth proportional to 100,979.35, 139,352.16 and 57,947.36 is: 79,967.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,979.35 : 139,352.16 = 57,947.36 : x
  2. Step 2: Convert to fraction form
    100,979.35/139,352.16 = 57,947.36/x
  3. Step 3: Cross multiply
    100,979.35x = 139,352.16 × 57,947.36
  4. Step 4: Simplify right side
    100,979.35x = 8,075,089,302.84
  5. Step 5: Solve for x
    x = 8,075,089,302.84/100,979.35
  6. Step 6: Final answer
    x = 79,967.73

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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.