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Finding the Fourth Proportional to 12,690.86, 19,038.34 and 4,368.86

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Solution

The fourth proportional to 12,690.86, 19,038.34 and 4,368.86 is: 6,554.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,690.86 : 19,038.34 = 4,368.86 : x
  2. Step 2: Convert to fraction form
    12,690.86/19,038.34 = 4,368.86/x
  3. Step 3: Cross multiply
    12,690.86x = 19,038.34 × 4,368.86
  4. Step 4: Simplify right side
    12,690.86x = 83,175,842.09
  5. Step 5: Solve for x
    x = 83,175,842.09/12,690.86
  6. Step 6: Final answer
    x = 6,554.00

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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.