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Finding the Fourth Proportional to 520,005.75, 780,008.63 and 126,021.75

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Solution

The fourth proportional to 520,005.75, 780,008.63 and 126,021.75 is: 189,032.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,005.75 : 780,008.63 = 126,021.75 : x
  2. Step 2: Convert to fraction form
    520,005.75/780,008.63 = 126,021.75/x
  3. Step 3: Cross multiply
    520,005.75x = 780,008.63 × 126,021.75
  4. Step 4: Simplify right side
    520,005.75x = 98,298,051,937.59
  5. Step 5: Solve for x
    x = 98,298,051,937.59/520,005.75
  6. Step 6: Final answer
    x = 189,032.63

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.