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Finding the Fourth Proportional to 101,291.60, 139,782.28 and 56,579.60

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Solution

The fourth proportional to 101,291.60, 139,782.28 and 56,579.60 is: 78,079.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,291.60 : 139,782.28 = 56,579.60 : x
  2. Step 2: Convert to fraction form
    101,291.60/139,782.28 = 56,579.60/x
  3. Step 3: Cross multiply
    101,291.60x = 139,782.28 × 56,579.60
  4. Step 4: Simplify right side
    101,291.60x = 7,908,825,489.49
  5. Step 5: Solve for x
    x = 7,908,825,489.49/101,291.60
  6. Step 6: Final answer
    x = 78,079.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.