Home / 81,048.09-121,590.11-31,128.20

Finding the Fourth Proportional to 81,048.09, 121,590.11 and 31,128.20

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Solution

The fourth proportional to 81,048.09, 121,590.11 and 31,128.20 is: 46,699.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,048.09 : 121,590.11 = 31,128.20 : x
  2. Step 2: Convert to fraction form
    81,048.09/121,590.11 = 31,128.20/x
  3. Step 3: Cross multiply
    81,048.09x = 121,590.11 × 31,128.20
  4. Step 4: Simplify right side
    81,048.09x = 3,784,881,262.10
  5. Step 5: Solve for x
    x = 3,784,881,262.10/81,048.09
  6. Step 6: Final answer
    x = 46,699.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.