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Finding the Fourth Proportional to 101,390.40, 139,928.85 and 56,071.80

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Solution

The fourth proportional to 101,390.40, 139,928.85 and 56,071.80 is: 77,384.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,390.40 : 139,928.85 = 56,071.80 : x
  2. Step 2: Convert to fraction form
    101,390.40/139,928.85 = 56,071.80/x
  3. Step 3: Cross multiply
    101,390.40x = 139,928.85 × 56,071.80
  4. Step 4: Simplify right side
    101,390.40x = 7,846,062,491.43
  5. Step 5: Solve for x
    x = 7,846,062,491.43/101,390.40
  6. Step 6: Final answer
    x = 77,384.67

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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.