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Finding the Fourth Proportional to 100,920.72, 139,281.54 and 55,603.35

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Solution

The fourth proportional to 100,920.72, 139,281.54 and 55,603.35 is: 76,738.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,920.72 : 139,281.54 = 55,603.35 : x
  2. Step 2: Convert to fraction form
    100,920.72/139,281.54 = 55,603.35/x
  3. Step 3: Cross multiply
    100,920.72x = 139,281.54 × 55,603.35
  4. Step 4: Simplify right side
    100,920.72x = 7,744,520,217.16
  5. Step 5: Solve for x
    x = 7,744,520,217.16/100,920.72
  6. Step 6: Final answer
    x = 76,738.65

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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.