Home / 100,012.10-138,014.61-54,689.57

Finding the Fourth Proportional to 100,012.10, 138,014.61 and 54,689.57

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Solution

The fourth proportional to 100,012.10, 138,014.61 and 54,689.57 is: 75,470.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,012.10 : 138,014.61 = 54,689.57 : x
  2. Step 2: Convert to fraction form
    100,012.10/138,014.61 = 54,689.57/x
  3. Step 3: Cross multiply
    100,012.10x = 138,014.61 × 54,689.57
  4. Step 4: Simplify right side
    100,012.10x = 7,547,958,984.54
  5. Step 5: Solve for x
    x = 7,547,958,984.54/100,012.10
  6. Step 6: Final answer
    x = 75,470.46

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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.