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Finding the Fourth Proportional to 112,178, 154,805.64 and 61,877

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Solution

The fourth proportional to 112,178, 154,805.64 and 61,877 is: 85,390.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,178 : 154,805.64 = 61,877 : x
  2. Step 2: Convert to fraction form
    112,178/154,805.64 = 61,877/x
  3. Step 3: Cross multiply
    112,178x = 154,805.64 × 61,877
  4. Step 4: Simplify right side
    112,178x = 9,578,908,586.28
  5. Step 5: Solve for x
    x = 9,578,908,586.28/112,178
  6. Step 6: Final answer
    x = 85,390.26

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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.