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Finding the Fourth Proportional to 61,420.60, 92,130.90 and 21,980.80

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Solution

The fourth proportional to 61,420.60, 92,130.90 and 21,980.80 is: 32,971.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,420.60 : 92,130.90 = 21,980.80 : x
  2. Step 2: Convert to fraction form
    61,420.60/92,130.90 = 21,980.80/x
  3. Step 3: Cross multiply
    61,420.60x = 92,130.90 × 21,980.80
  4. Step 4: Simplify right side
    61,420.60x = 2,025,110,886.72
  5. Step 5: Solve for x
    x = 2,025,110,886.72/61,420.60
  6. Step 6: Final answer
    x = 32,971.20

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Double scale
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Similar ratio
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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.