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Finding the Fourth Proportional to 520,021.70, 780,032.55 and 436,040.90

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Solution

The fourth proportional to 520,021.70, 780,032.55 and 436,040.90 is: 654,061.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,021.70 : 780,032.55 = 436,040.90 : x
  2. Step 2: Convert to fraction form
    520,021.70/780,032.55 = 436,040.90/x
  3. Step 3: Cross multiply
    520,021.70x = 780,032.55 × 436,040.90
  4. Step 4: Simplify right side
    520,021.70x = 340,126,095,131.30
  5. Step 5: Solve for x
    x = 340,126,095,131.30/520,021.70
  6. Step 6: Final answer
    x = 654,061.35

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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.