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Finding the Fourth Proportional to 100,064.64, 137,930.40 and 78,810.24

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Solution

The fourth proportional to 100,064.64, 137,930.40 and 78,810.24 is: 108,633.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,064.64 : 137,930.40 = 78,810.24 : x
  2. Step 2: Convert to fraction form
    100,064.64/137,930.40 = 78,810.24/x
  3. Step 3: Cross multiply
    100,064.64x = 137,930.40 × 78,810.24
  4. Step 4: Simplify right side
    100,064.64x = 10,870,327,927.30
  5. Step 5: Solve for x
    x = 10,870,327,927.30/100,064.64
  6. Step 6: Final answer
    x = 108,633.06

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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.