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Finding the Fourth Proportional to 53,985.60, 80,920.80 and 20,692.80

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Solution

The fourth proportional to 53,985.60, 80,920.80 and 20,692.80 is: 31,017.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    53,985.60 : 80,920.80 = 20,692.80 : x
  2. Step 2: Convert to fraction form
    53,985.60/80,920.80 = 20,692.80/x
  3. Step 3: Cross multiply
    53,985.60x = 80,920.80 × 20,692.80
  4. Step 4: Simplify right side
    53,985.60x = 1,674,477,930.24
  5. Step 5: Solve for x
    x = 1,674,477,930.24/53,985.60
  6. Step 6: Final answer
    x = 31,017.12

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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.