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Finding the Fourth Proportional to 85,625.56, 128,438.34 and 46,430.88

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Solution

The fourth proportional to 85,625.56, 128,438.34 and 46,430.88 is: 69,646.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,625.56 : 128,438.34 = 46,430.88 : x
  2. Step 2: Convert to fraction form
    85,625.56/128,438.34 = 46,430.88/x
  3. Step 3: Cross multiply
    85,625.56x = 128,438.34 × 46,430.88
  4. Step 4: Simplify right side
    85,625.56x = 5,963,505,151.94
  5. Step 5: Solve for x
    x = 5,963,505,151.94/85,625.56
  6. Step 6: Final answer
    x = 69,646.32

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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.