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Finding the Fourth Proportional to 100,959.85, 139,323.95 and 55,638.19

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Solution

The fourth proportional to 100,959.85, 139,323.95 and 55,638.19 is: 76,780.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,959.85 : 139,323.95 = 55,638.19 : x
  2. Step 2: Convert to fraction form
    100,959.85/139,323.95 = 55,638.19/x
  3. Step 3: Cross multiply
    100,959.85x = 139,323.95 × 55,638.19
  4. Step 4: Simplify right side
    100,959.85x = 7,751,732,123.46
  5. Step 5: Solve for x
    x = 7,751,732,123.46/100,959.85
  6. Step 6: Final answer
    x = 76,780.35

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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.