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Finding the Fourth Proportional to 100,927, 139,279.26 and 56,217.88

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Solution

The fourth proportional to 100,927, 139,279.26 and 56,217.88 is: 77,580.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,927 : 139,279.26 = 56,217.88 : x
  2. Step 2: Convert to fraction form
    100,927/139,279.26 = 56,217.88/x
  3. Step 3: Cross multiply
    100,927x = 139,279.26 × 56,217.88
  4. Step 4: Simplify right side
    100,927x = 7,829,984,725.17
  5. Step 5: Solve for x
    x = 7,829,984,725.17/100,927
  6. Step 6: Final answer
    x = 77,580.67

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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.