Home / 13,870.20-19,139.58-7,903.20

Finding the Fourth Proportional to 13,870.20, 19,139.58 and 7,903.20

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Solution

The fourth proportional to 13,870.20, 19,139.58 and 7,903.20 is: 10,905.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,870.20 : 19,139.58 = 7,903.20 : x
  2. Step 2: Convert to fraction form
    13,870.20/19,139.58 = 7,903.20/x
  3. Step 3: Cross multiply
    13,870.20x = 19,139.58 × 7,903.20
  4. Step 4: Simplify right side
    13,870.20x = 151,263,928.66
  5. Step 5: Solve for x
    x = 151,263,928.66/13,870.20
  6. Step 6: Final answer
    x = 10,905.68

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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.