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Finding the Fourth Proportional to 12,870.60, 19,305.90 and 6,309.60

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Solution

The fourth proportional to 12,870.60, 19,305.90 and 6,309.60 is: 9,464.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,870.60 : 19,305.90 = 6,309.60 : x
  2. Step 2: Convert to fraction form
    12,870.60/19,305.90 = 6,309.60/x
  3. Step 3: Cross multiply
    12,870.60x = 19,305.90 × 6,309.60
  4. Step 4: Simplify right side
    12,870.60x = 121,812,506.64
  5. Step 5: Solve for x
    x = 121,812,506.64/12,870.60
  6. Step 6: Final answer
    x = 9,464.40

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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.