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Finding the Fourth Proportional to 118,320, 163,281.60 and 80,660.16

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Solution

The fourth proportional to 118,320, 163,281.60 and 80,660.16 is: 111,311.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,320 : 163,281.60 = 80,660.16 : x
  2. Step 2: Convert to fraction form
    118,320/163,281.60 = 80,660.16/x
  3. Step 3: Cross multiply
    118,320x = 163,281.60 × 80,660.16
  4. Step 4: Simplify right side
    118,320x = 13,170,319,981.06
  5. Step 5: Solve for x
    x = 13,170,319,981.06/118,320
  6. Step 6: Final answer
    x = 111,311.02

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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.