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Finding the Fourth Proportional to 520,075.90, 780,113.85 and 415,099.90

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Solution

The fourth proportional to 520,075.90, 780,113.85 and 415,099.90 is: 622,649.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,075.90 : 780,113.85 = 415,099.90 : x
  2. Step 2: Convert to fraction form
    520,075.90/780,113.85 = 415,099.90/x
  3. Step 3: Cross multiply
    520,075.90x = 780,113.85 × 415,099.90
  4. Step 4: Simplify right side
    520,075.90x = 323,825,181,123.62
  5. Step 5: Solve for x
    x = 323,825,181,123.62/520,075.90
  6. Step 6: Final answer
    x = 622,649.85

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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.