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Finding the Fourth Proportional to 85,611.70, 128,417.55 and 26,442.10

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Solution

The fourth proportional to 85,611.70, 128,417.55 and 26,442.10 is: 39,663.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,611.70 : 128,417.55 = 26,442.10 : x
  2. Step 2: Convert to fraction form
    85,611.70/128,417.55 = 26,442.10/x
  3. Step 3: Cross multiply
    85,611.70x = 128,417.55 × 26,442.10
  4. Step 4: Simplify right side
    85,611.70x = 3,395,629,698.86
  5. Step 5: Solve for x
    x = 3,395,629,698.86/85,611.70
  6. Step 6: Final answer
    x = 39,663.15

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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.