Home / 138,556.68-191,210.24-78,130.20

Finding the Fourth Proportional to 138,556.68, 191,210.24 and 78,130.20

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Solution

The fourth proportional to 138,556.68, 191,210.24 and 78,130.20 is: 107,820.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,556.68 : 191,210.24 = 78,130.20 : x
  2. Step 2: Convert to fraction form
    138,556.68/191,210.24 = 78,130.20/x
  3. Step 3: Cross multiply
    138,556.68x = 191,210.24 × 78,130.20
  4. Step 4: Simplify right side
    138,556.68x = 14,939,294,293.25
  5. Step 5: Solve for x
    x = 14,939,294,293.25/138,556.68
  6. Step 6: Final answer
    x = 107,820.82

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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.