Home / 100,781.04-139,135.44-66,835.72

Finding the Fourth Proportional to 100,781.04, 139,135.44 and 66,835.72

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Solution

The fourth proportional to 100,781.04, 139,135.44 and 66,835.72 is: 92,271.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,781.04 : 139,135.44 = 66,835.72 : x
  2. Step 2: Convert to fraction form
    100,781.04/139,135.44 = 66,835.72/x
  3. Step 3: Cross multiply
    100,781.04x = 139,135.44 × 66,835.72
  4. Step 4: Simplify right side
    100,781.04x = 9,299,217,309.92
  5. Step 5: Solve for x
    x = 9,299,217,309.92/100,781.04
  6. Step 6: Final answer
    x = 92,271.50

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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.