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Finding the Fourth Proportional to 42,777.45, 64,173.45 and 13,189.77

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Solution

The fourth proportional to 42,777.45, 64,173.45 and 13,189.77 is: 19,786.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,777.45 : 64,173.45 = 13,189.77 : x
  2. Step 2: Convert to fraction form
    42,777.45/64,173.45 = 13,189.77/x
  3. Step 3: Cross multiply
    42,777.45x = 64,173.45 × 13,189.77
  4. Step 4: Simplify right side
    42,777.45x = 846,433,045.61
  5. Step 5: Solve for x
    x = 846,433,045.61/42,777.45
  6. Step 6: Final answer
    x = 19,786.90

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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.