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Finding the Fourth Proportional to 85,605.41, 128,220.86 and 43,412.78

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Solution

The fourth proportional to 85,605.41, 128,220.86 and 43,412.78 is: 65,024.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,605.41 : 128,220.86 = 43,412.78 : x
  2. Step 2: Convert to fraction form
    85,605.41/128,220.86 = 43,412.78/x
  3. Step 3: Cross multiply
    85,605.41x = 128,220.86 × 43,412.78
  4. Step 4: Simplify right side
    85,605.41x = 5,566,423,128.42
  5. Step 5: Solve for x
    x = 5,566,423,128.42/85,605.41
  6. Step 6: Final answer
    x = 65,024.20

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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.