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Finding the Fourth Proportional to 111,391, 153,719.58 and 61,090

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Solution

The fourth proportional to 111,391, 153,719.58 and 61,090 is: 84,304.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,391 : 153,719.58 = 61,090 : x
  2. Step 2: Convert to fraction form
    111,391/153,719.58 = 61,090/x
  3. Step 3: Cross multiply
    111,391x = 153,719.58 × 61,090
  4. Step 4: Simplify right side
    111,391x = 9,390,729,142.20
  5. Step 5: Solve for x
    x = 9,390,729,142.20/111,391
  6. Step 6: Final answer
    x = 84,304.20

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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.