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Finding the Fourth Proportional to 15,879.70, 21,863.99 and 13,484.93

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Solution

The fourth proportional to 15,879.70, 21,863.99 and 13,484.93 is: 18,566.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,879.70 : 21,863.99 = 13,484.93 : x
  2. Step 2: Convert to fraction form
    15,879.70/21,863.99 = 13,484.93/x
  3. Step 3: Cross multiply
    15,879.70x = 21,863.99 × 13,484.93
  4. Step 4: Simplify right side
    15,879.70x = 294,834,307.25
  5. Step 5: Solve for x
    x = 294,834,307.25/15,879.70
  6. Step 6: Final answer
    x = 18,566.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.