Home / 21,362.40-29,479.68-12,981.60

Finding the Fourth Proportional to 21,362.40, 29,479.68 and 12,981.60

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Solution

The fourth proportional to 21,362.40, 29,479.68 and 12,981.60 is: 17,914.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,362.40 : 29,479.68 = 12,981.60 : x
  2. Step 2: Convert to fraction form
    21,362.40/29,479.68 = 12,981.60/x
  3. Step 3: Cross multiply
    21,362.40x = 29,479.68 × 12,981.60
  4. Step 4: Simplify right side
    21,362.40x = 382,693,413.89
  5. Step 5: Solve for x
    x = 382,693,413.89/21,362.40
  6. Step 6: Final answer
    x = 17,914.35

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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.