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Finding the Fourth Proportional to 12,807.10, 19,210.65 and 12,720.70

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Solution

The fourth proportional to 12,807.10, 19,210.65 and 12,720.70 is: 19,081.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,807.10 : 19,210.65 = 12,720.70 : x
  2. Step 2: Convert to fraction form
    12,807.10/19,210.65 = 12,720.70/x
  3. Step 3: Cross multiply
    12,807.10x = 19,210.65 × 12,720.70
  4. Step 4: Simplify right side
    12,807.10x = 244,372,915.46
  5. Step 5: Solve for x
    x = 244,372,915.46/12,807.10
  6. Step 6: Final answer
    x = 19,081.05

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Similar ratio
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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.