Home / 100,490.04-138,677.88-55,172.20

Finding the Fourth Proportional to 100,490.04, 138,677.88 and 55,172.20

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Solution

The fourth proportional to 100,490.04, 138,677.88 and 55,172.20 is: 76,138.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,490.04 : 138,677.88 = 55,172.20 : x
  2. Step 2: Convert to fraction form
    100,490.04/138,677.88 = 55,172.20/x
  3. Step 3: Cross multiply
    100,490.04x = 138,677.88 × 55,172.20
  4. Step 4: Simplify right side
    100,490.04x = 7,651,163,730.94
  5. Step 5: Solve for x
    x = 7,651,163,730.94/100,490.04
  6. Step 6: Final answer
    x = 76,138.53

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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.