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Finding the Fourth Proportional to 12,390.66, 17,098.65 and 7,085.34

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Solution

The fourth proportional to 12,390.66, 17,098.65 and 7,085.34 is: 9,777.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,390.66 : 17,098.65 = 7,085.34 : x
  2. Step 2: Convert to fraction form
    12,390.66/17,098.65 = 7,085.34/x
  3. Step 3: Cross multiply
    12,390.66x = 17,098.65 × 7,085.34
  4. Step 4: Simplify right side
    12,390.66x = 121,149,748.79
  5. Step 5: Solve for x
    x = 121,149,748.79/12,390.66
  6. Step 6: Final answer
    x = 9,777.51

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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.