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Finding the Fourth Proportional to 18,870.80, 28,306.08 and 4,830.80

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Solution

The fourth proportional to 18,870.80, 28,306.08 and 4,830.80 is: 7,246.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,870.80 : 28,306.08 = 4,830.80 : x
  2. Step 2: Convert to fraction form
    18,870.80/28,306.08 = 4,830.80/x
  3. Step 3: Cross multiply
    18,870.80x = 28,306.08 × 4,830.80
  4. Step 4: Simplify right side
    18,870.80x = 136,740,869.73
  5. Step 5: Solve for x
    x = 136,740,869.73/18,870.80
  6. Step 6: Final answer
    x = 7,246.16

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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.