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Finding the Fourth Proportional to 111,987.30, 154,542.48 and 61,686.30

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Solution

The fourth proportional to 111,987.30, 154,542.48 and 61,686.30 is: 85,127.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,987.30 : 154,542.48 = 61,686.30 : x
  2. Step 2: Convert to fraction form
    111,987.30/154,542.48 = 61,686.30/x
  3. Step 3: Cross multiply
    111,987.30x = 154,542.48 × 61,686.30
  4. Step 4: Simplify right side
    111,987.30x = 9,533,153,784.02
  5. Step 5: Solve for x
    x = 9,533,153,784.02/111,987.30
  6. Step 6: Final answer
    x = 85,127.10

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1.5x scale

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.