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Finding the Fourth Proportional to 99,814.71, 137,739.51 and 56,790.21

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Solution

The fourth proportional to 99,814.71, 137,739.51 and 56,790.21 is: 78,367.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,814.71 : 137,739.51 = 56,790.21 : x
  2. Step 2: Convert to fraction form
    99,814.71/137,739.51 = 56,790.21/x
  3. Step 3: Cross multiply
    99,814.71x = 137,739.51 × 56,790.21
  4. Step 4: Simplify right side
    99,814.71x = 7,822,255,698.20
  5. Step 5: Solve for x
    x = 7,822,255,698.20/99,814.71
  6. Step 6: Final answer
    x = 78,367.76

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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.