Home / 100,897.92-139,255.74-76,979.40

Finding the Fourth Proportional to 100,897.92, 139,255.74 and 76,979.40

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Solution

The fourth proportional to 100,897.92, 139,255.74 and 76,979.40 is: 106,244.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,897.92 : 139,255.74 = 76,979.40 : x
  2. Step 2: Convert to fraction form
    100,897.92/139,255.74 = 76,979.40/x
  3. Step 3: Cross multiply
    100,897.92x = 139,255.74 × 76,979.40
  4. Step 4: Simplify right side
    100,897.92x = 10,719,823,311.76
  5. Step 5: Solve for x
    x = 10,719,823,311.76/100,897.92
  6. Step 6: Final answer
    x = 106,244.24

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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.