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Finding the Fourth Proportional to 100,859.90, 139,185.51 and 55,536.95

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Solution

The fourth proportional to 100,859.90, 139,185.51 and 55,536.95 is: 76,640.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,859.90 : 139,185.51 = 55,536.95 : x
  2. Step 2: Convert to fraction form
    100,859.90/139,185.51 = 55,536.95/x
  3. Step 3: Cross multiply
    100,859.90x = 139,185.51 × 55,536.95
  4. Step 4: Simplify right side
    100,859.90x = 7,729,938,013.67
  5. Step 5: Solve for x
    x = 7,729,938,013.67/100,859.90
  6. Step 6: Final answer
    x = 76,640.35

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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.