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Finding the Fourth Proportional to 111,990.92, 154,547.48 and 61,689.92

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Solution

The fourth proportional to 111,990.92, 154,547.48 and 61,689.92 is: 85,132.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,990.92 : 154,547.48 = 61,689.92 : x
  2. Step 2: Convert to fraction form
    111,990.92/154,547.48 = 61,689.92/x
  3. Step 3: Cross multiply
    111,990.92x = 154,547.48 × 61,689.92
  4. Step 4: Simplify right side
    111,990.92x = 9,534,021,677.40
  5. Step 5: Solve for x
    x = 9,534,021,677.40/111,990.92
  6. Step 6: Final answer
    x = 85,132.10

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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.