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Finding the Fourth Proportional to 111,578.32, 153,980.76 and 61,278.40

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Solution

The fourth proportional to 111,578.32, 153,980.76 and 61,278.40 is: 84,565.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,578.32 : 153,980.76 = 61,278.40 : x
  2. Step 2: Convert to fraction form
    111,578.32/153,980.76 = 61,278.40/x
  3. Step 3: Cross multiply
    111,578.32x = 153,980.76 × 61,278.40
  4. Step 4: Simplify right side
    111,578.32x = 9,435,694,603.58
  5. Step 5: Solve for x
    x = 9,435,694,603.58/111,578.32
  6. Step 6: Final answer
    x = 84,565.66

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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.