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Finding the Fourth Proportional to 85,418.90, 128,128.80 and 56,022.88

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Solution

The fourth proportional to 85,418.90, 128,128.80 and 56,022.88 is: 84,034.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,418.90 : 128,128.80 = 56,022.88 : x
  2. Step 2: Convert to fraction form
    85,418.90/128,128.80 = 56,022.88/x
  3. Step 3: Cross multiply
    85,418.90x = 128,128.80 × 56,022.88
  4. Step 4: Simplify right side
    85,418.90x = 7,178,144,547.11
  5. Step 5: Solve for x
    x = 7,178,144,547.11/85,418.90
  6. Step 6: Final answer
    x = 84,034.62

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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.