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Finding the Fourth Proportional to 85,878.21, 128,839.29 and 26,714.40

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Solution

The fourth proportional to 85,878.21, 128,839.29 and 26,714.40 is: 40,078.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,878.21 : 128,839.29 = 26,714.40 : x
  2. Step 2: Convert to fraction form
    85,878.21/128,839.29 = 26,714.40/x
  3. Step 3: Cross multiply
    85,878.21x = 128,839.29 × 26,714.40
  4. Step 4: Simplify right side
    85,878.21x = 3,441,864,328.78
  5. Step 5: Solve for x
    x = 3,441,864,328.78/85,878.21
  6. Step 6: Final answer
    x = 40,078.44

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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.