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Finding the Fourth Proportional to 12,905.60, 17,808.93 and 7,239.30

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Solution

The fourth proportional to 12,905.60, 17,808.93 and 7,239.30 is: 9,989.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,905.60 : 17,808.93 = 7,239.30 : x
  2. Step 2: Convert to fraction form
    12,905.60/17,808.93 = 7,239.30/x
  3. Step 3: Cross multiply
    12,905.60x = 17,808.93 × 7,239.30
  4. Step 4: Simplify right side
    12,905.60x = 128,924,186.95
  5. Step 5: Solve for x
    x = 128,924,186.95/12,905.60
  6. Step 6: Final answer
    x = 9,989.79

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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.