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Finding the Fourth Proportional to 85,770.90, 128,656.35 and 57,777.30

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Solution

The fourth proportional to 85,770.90, 128,656.35 and 57,777.30 is: 86,665.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,770.90 : 128,656.35 = 57,777.30 : x
  2. Step 2: Convert to fraction form
    85,770.90/128,656.35 = 57,777.30/x
  3. Step 3: Cross multiply
    85,770.90x = 128,656.35 × 57,777.30
  4. Step 4: Simplify right side
    85,770.90x = 7,433,416,530.86
  5. Step 5: Solve for x
    x = 7,433,416,530.86/85,770.90
  6. Step 6: Final answer
    x = 86,665.95

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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.