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Finding the Fourth Proportional to 85,477.80, 128,189.34 and 28,539.48

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Solution

The fourth proportional to 85,477.80, 128,189.34 and 28,539.48 is: 42,800.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,477.80 : 128,189.34 = 28,539.48 : x
  2. Step 2: Convert to fraction form
    85,477.80/128,189.34 = 28,539.48/x
  3. Step 3: Cross multiply
    85,477.80x = 128,189.34 × 28,539.48
  4. Step 4: Simplify right side
    85,477.80x = 3,658,457,105.14
  5. Step 5: Solve for x
    x = 3,658,457,105.14/85,477.80
  6. Step 6: Final answer
    x = 42,800.08

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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.