Home / 83,420.57-115,127.48-47,128.68

Finding the Fourth Proportional to 83,420.57, 115,127.48 and 47,128.68

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Solution

The fourth proportional to 83,420.57, 115,127.48 and 47,128.68 is: 65,041.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,420.57 : 115,127.48 = 47,128.68 : x
  2. Step 2: Convert to fraction form
    83,420.57/115,127.48 = 47,128.68/x
  3. Step 3: Cross multiply
    83,420.57x = 115,127.48 × 47,128.68
  4. Step 4: Simplify right side
    83,420.57x = 5,425,806,112.69
  5. Step 5: Solve for x
    x = 5,425,806,112.69/83,420.57
  6. Step 6: Final answer
    x = 65,041.59

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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.