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Finding the Fourth Proportional to 18,719.66, 28,070.72 and 6,870.48

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Solution

The fourth proportional to 18,719.66, 28,070.72 and 6,870.48 is: 10,302.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,719.66 : 28,070.72 = 6,870.48 : x
  2. Step 2: Convert to fraction form
    18,719.66/28,070.72 = 6,870.48/x
  3. Step 3: Cross multiply
    18,719.66x = 28,070.72 × 6,870.48
  4. Step 4: Simplify right side
    18,719.66x = 192,859,320.35
  5. Step 5: Solve for x
    x = 192,859,320.35/18,719.66
  6. Step 6: Final answer
    x = 10,302.50

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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.