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Finding the Fourth Proportional to 21,866.40, 31,618.80 and 21,866.40

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Solution

The fourth proportional to 21,866.40, 31,618.80 and 21,866.40 is: 31,618.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,866.40 : 31,618.80 = 21,866.40 : x
  2. Step 2: Convert to fraction form
    21,866.40/31,618.80 = 21,866.40/x
  3. Step 3: Cross multiply
    21,866.40x = 31,618.80 × 21,866.40
  4. Step 4: Simplify right side
    21,866.40x = 691,389,328.32
  5. Step 5: Solve for x
    x = 691,389,328.32/21,866.40
  6. Step 6: Final answer
    x = 31,618.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.45) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.