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Finding the Fourth Proportional to 19,246.80, 28,870.20 and 12,603.90

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Solution

The fourth proportional to 19,246.80, 28,870.20 and 12,603.90 is: 18,905.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,246.80 : 28,870.20 = 12,603.90 : x
  2. Step 2: Convert to fraction form
    19,246.80/28,870.20 = 12,603.90/x
  3. Step 3: Cross multiply
    19,246.80x = 28,870.20 × 12,603.90
  4. Step 4: Simplify right side
    19,246.80x = 363,877,113.78
  5. Step 5: Solve for x
    x = 363,877,113.78/19,246.80
  6. Step 6: Final answer
    x = 18,905.85

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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.