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Finding the Fourth Proportional to 12,881.60, 17,809.68 and 9,907.28

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Solution

The fourth proportional to 12,881.60, 17,809.68 and 9,907.28 is: 13,697.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,881.60 : 17,809.68 = 9,907.28 : x
  2. Step 2: Convert to fraction form
    12,881.60/17,809.68 = 9,907.28/x
  3. Step 3: Cross multiply
    12,881.60x = 17,809.68 × 9,907.28
  4. Step 4: Simplify right side
    12,881.60x = 176,445,486.47
  5. Step 5: Solve for x
    x = 176,445,486.47/12,881.60
  6. Step 6: Final answer
    x = 13,697.48

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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.