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Finding the Fourth Proportional to 98,721.81, 136,239.23 and 54,009.81

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Solution

The fourth proportional to 98,721.81, 136,239.23 and 54,009.81 is: 74,535.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,721.81 : 136,239.23 = 54,009.81 : x
  2. Step 2: Convert to fraction form
    98,721.81/136,239.23 = 54,009.81/x
  3. Step 3: Cross multiply
    98,721.81x = 136,239.23 × 54,009.81
  4. Step 4: Simplify right side
    98,721.81x = 7,358,254,656.80
  5. Step 5: Solve for x
    x = 7,358,254,656.80/98,721.81
  6. Step 6: Final answer
    x = 74,535.25

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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.