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Finding the Fourth Proportional to 11,801.60, 17,702.40 and 9,987.20

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Solution

The fourth proportional to 11,801.60, 17,702.40 and 9,987.20 is: 14,980.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,801.60 : 17,702.40 = 9,987.20 : x
  2. Step 2: Convert to fraction form
    11,801.60/17,702.40 = 9,987.20/x
  3. Step 3: Cross multiply
    11,801.60x = 17,702.40 × 9,987.20
  4. Step 4: Simplify right side
    11,801.60x = 176,797,409.28
  5. Step 5: Solve for x
    x = 176,797,409.28/11,801.60
  6. Step 6: Final answer
    x = 14,980.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.