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Finding the Fourth Proportional to 15,777.60, 21,770.55 and 8,970.90

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Solution

The fourth proportional to 15,777.60, 21,770.55 and 8,970.90 is: 12,378.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,777.60 : 21,770.55 = 8,970.90 : x
  2. Step 2: Convert to fraction form
    15,777.60/21,770.55 = 8,970.90/x
  3. Step 3: Cross multiply
    15,777.60x = 21,770.55 × 8,970.90
  4. Step 4: Simplify right side
    15,777.60x = 195,301,427.00
  5. Step 5: Solve for x
    x = 195,301,427.00/15,777.60
  6. Step 6: Final answer
    x = 12,378.40

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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.