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Finding the Fourth Proportional to 8,708.66, 12,018.40 and 5,123.80

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Solution

The fourth proportional to 8,708.66, 12,018.40 and 5,123.80 is: 7,071.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,708.66 : 12,018.40 = 5,123.80 : x
  2. Step 2: Convert to fraction form
    8,708.66/12,018.40 = 5,123.80/x
  3. Step 3: Cross multiply
    8,708.66x = 12,018.40 × 5,123.80
  4. Step 4: Simplify right side
    8,708.66x = 61,579,877.92
  5. Step 5: Solve for x
    x = 61,579,877.92/8,708.66
  6. Step 6: Final answer
    x = 7,071.11

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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.