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Finding the Fourth Proportional to 61,220.40, 91,830.60 and 21,778.80

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Solution

The fourth proportional to 61,220.40, 91,830.60 and 21,778.80 is: 32,668.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,220.40 : 91,830.60 = 21,778.80 : x
  2. Step 2: Convert to fraction form
    61,220.40/91,830.60 = 21,778.80/x
  3. Step 3: Cross multiply
    61,220.40x = 91,830.60 × 21,778.80
  4. Step 4: Simplify right side
    61,220.40x = 1,999,960,271.28
  5. Step 5: Solve for x
    x = 1,999,960,271.28/61,220.40
  6. Step 6: Final answer
    x = 32,668.20

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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.