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Finding the Fourth Proportional to 19,305.40, 28,968.90 and 8,210.20

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Solution

The fourth proportional to 19,305.40, 28,968.90 and 8,210.20 is: 12,319.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,305.40 : 28,968.90 = 8,210.20 : x
  2. Step 2: Convert to fraction form
    19,305.40/28,968.90 = 8,210.20/x
  3. Step 3: Cross multiply
    19,305.40x = 28,968.90 × 8,210.20
  4. Step 4: Simplify right side
    19,305.40x = 237,840,462.78
  5. Step 5: Solve for x
    x = 237,840,462.78/19,305.40
  6. Step 6: Final answer
    x = 12,319.89

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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.