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Finding the Fourth Proportional to 21,316.91, 29,413.90 and 12,817.00

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Solution

The fourth proportional to 21,316.91, 29,413.90 and 12,817.00 is: 17,685.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,316.91 : 29,413.90 = 12,817.00 : x
  2. Step 2: Convert to fraction form
    21,316.91/29,413.90 = 12,817.00/x
  3. Step 3: Cross multiply
    21,316.91x = 29,413.90 × 12,817.00
  4. Step 4: Simplify right side
    21,316.91x = 376,997,830.93
  5. Step 5: Solve for x
    x = 376,997,830.93/21,316.91
  6. Step 6: Final answer
    x = 17,685.39

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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.