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Finding the Fourth Proportional to 111,688, 154,129.44 and 61,387

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Solution

The fourth proportional to 111,688, 154,129.44 and 61,387 is: 84,714.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,688 : 154,129.44 = 61,387 : x
  2. Step 2: Convert to fraction form
    111,688/154,129.44 = 61,387/x
  3. Step 3: Cross multiply
    111,688x = 154,129.44 × 61,387
  4. Step 4: Simplify right side
    111,688x = 9,461,543,933.28
  5. Step 5: Solve for x
    x = 9,461,543,933.28/111,688
  6. Step 6: Final answer
    x = 84,714.06

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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.