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Finding the Fourth Proportional to 101,038.70, 139,430.21 and 55,718.60

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Solution

The fourth proportional to 101,038.70, 139,430.21 and 55,718.60 is: 76,889.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,038.70 : 139,430.21 = 55,718.60 : x
  2. Step 2: Convert to fraction form
    101,038.70/139,430.21 = 55,718.60/x
  3. Step 3: Cross multiply
    101,038.70x = 139,430.21 × 55,718.60
  4. Step 4: Simplify right side
    101,038.70x = 7,768,855,401.75
  5. Step 5: Solve for x
    x = 7,768,855,401.75/101,038.70
  6. Step 6: Final answer
    x = 76,889.90

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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.