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Finding the Fourth Proportional to 85,418.65, 128,128.43 and 56,022.63

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Solution

The fourth proportional to 85,418.65, 128,128.43 and 56,022.63 is: 84,034.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,418.65 : 128,128.43 = 56,022.63 : x
  2. Step 2: Convert to fraction form
    85,418.65/128,128.43 = 56,022.63/x
  3. Step 3: Cross multiply
    85,418.65x = 128,128.43 × 56,022.63
  4. Step 4: Simplify right side
    85,418.65x = 7,178,091,346.26
  5. Step 5: Solve for x
    x = 7,178,091,346.26/85,418.65
  6. Step 6: Final answer
    x = 84,034.25

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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.