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Finding the Fourth Proportional to 86,673.80, 130,010.70 and 21,009.80

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Solution

The fourth proportional to 86,673.80, 130,010.70 and 21,009.80 is: 31,514.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,673.80 : 130,010.70 = 21,009.80 : x
  2. Step 2: Convert to fraction form
    86,673.80/130,010.70 = 21,009.80/x
  3. Step 3: Cross multiply
    86,673.80x = 130,010.70 × 21,009.80
  4. Step 4: Simplify right side
    86,673.80x = 2,731,498,804.86
  5. Step 5: Solve for x
    x = 2,731,498,804.86/86,673.80
  6. Step 6: Final answer
    x = 31,514.70

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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.