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Finding the Fourth Proportional to 86,673.13, 130,009.69 and 21,009.13

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Solution

The fourth proportional to 86,673.13, 130,009.69 and 21,009.13 is: 31,513.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,673.13 : 130,009.69 = 21,009.13 : x
  2. Step 2: Convert to fraction form
    86,673.13/130,009.69 = 21,009.13/x
  3. Step 3: Cross multiply
    86,673.13x = 130,009.69 × 21,009.13
  4. Step 4: Simplify right side
    86,673.13x = 2,731,390,478.47
  5. Step 5: Solve for x
    x = 2,731,390,478.47/86,673.13
  6. Step 6: Final answer
    x = 31,513.69

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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.