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Finding the Fourth Proportional to 9,778, 13,447.20 and 7,764.88

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Solution

The fourth proportional to 9,778, 13,447.20 and 7,764.88 is: 10,678.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,778 : 13,447.20 = 7,764.88 : x
  2. Step 2: Convert to fraction form
    9,778/13,447.20 = 7,764.88/x
  3. Step 3: Cross multiply
    9,778x = 13,447.20 × 7,764.88
  4. Step 4: Simplify right side
    9,778x = 104,415,894.34
  5. Step 5: Solve for x
    x = 104,415,894.34/9,778
  6. Step 6: Final answer
    x = 10,678.66

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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.