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Finding the Fourth Proportional to 18,719.70, 28,079.55 and 4,868.70

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Solution

The fourth proportional to 18,719.70, 28,079.55 and 4,868.70 is: 7,303.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,719.70 : 28,079.55 = 4,868.70 : x
  2. Step 2: Convert to fraction form
    18,719.70/28,079.55 = 4,868.70/x
  3. Step 3: Cross multiply
    18,719.70x = 28,079.55 × 4,868.70
  4. Step 4: Simplify right side
    18,719.70x = 136,710,905.09
  5. Step 5: Solve for x
    x = 136,710,905.09/18,719.70
  6. Step 6: Final answer
    x = 7,303.05

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.