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Finding the Fourth Proportional to 85,726.80, 128,590.20 and 26,580.60

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Solution

The fourth proportional to 85,726.80, 128,590.20 and 26,580.60 is: 39,870.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,726.80 : 128,590.20 = 26,580.60 : x
  2. Step 2: Convert to fraction form
    85,726.80/128,590.20 = 26,580.60/x
  3. Step 3: Cross multiply
    85,726.80x = 128,590.20 × 26,580.60
  4. Step 4: Simplify right side
    85,726.80x = 3,418,004,670.12
  5. Step 5: Solve for x
    x = 3,418,004,670.12/85,726.80
  6. Step 6: Final answer
    x = 39,870.90

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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.