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Finding the Fourth Proportional to 520,085.90, 780,128.85 and 520,085.90

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Solution

The fourth proportional to 520,085.90, 780,128.85 and 520,085.90 is: 780,128.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,085.90 : 780,128.85 = 520,085.90 : x
  2. Step 2: Convert to fraction form
    520,085.90/780,128.85 = 520,085.90/x
  3. Step 3: Cross multiply
    520,085.90x = 780,128.85 × 520,085.90
  4. Step 4: Simplify right side
    520,085.90x = 405,734,015,068.22
  5. Step 5: Solve for x
    x = 405,734,015,068.22/520,085.90
  6. Step 6: Final answer
    x = 780,128.85

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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.