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Finding the Fourth Proportional to 111,990.75, 154,547.24 and 61,689.75

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Solution

The fourth proportional to 111,990.75, 154,547.24 and 61,689.75 is: 85,131.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,990.75 : 154,547.24 = 61,689.75 : x
  2. Step 2: Convert to fraction form
    111,990.75/154,547.24 = 61,689.75/x
  3. Step 3: Cross multiply
    111,990.75x = 154,547.24 × 61,689.75
  4. Step 4: Simplify right side
    111,990.75x = 9,533,980,290.34
  5. Step 5: Solve for x
    x = 9,533,980,290.34/111,990.75
  6. Step 6: Final answer
    x = 85,131.86

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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.