Home / 13,118.02-18,100.75-7,812.70

Finding the Fourth Proportional to 13,118.02, 18,100.75 and 7,812.70

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Solution

The fourth proportional to 13,118.02, 18,100.75 and 7,812.70 is: 10,780.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,118.02 : 18,100.75 = 7,812.70 : x
  2. Step 2: Convert to fraction form
    13,118.02/18,100.75 = 7,812.70/x
  3. Step 3: Cross multiply
    13,118.02x = 18,100.75 × 7,812.70
  4. Step 4: Simplify right side
    13,118.02x = 141,415,729.53
  5. Step 5: Solve for x
    x = 141,415,729.53/13,118.02
  6. Step 6: Final answer
    x = 10,780.26

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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.