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Finding the Fourth Proportional to 520,075.70, 780,113.55 and 485,083.70

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Solution

The fourth proportional to 520,075.70, 780,113.55 and 485,083.70 is: 727,625.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,075.70 : 780,113.55 = 485,083.70 : x
  2. Step 2: Convert to fraction form
    520,075.70/780,113.55 = 485,083.70/x
  3. Step 3: Cross multiply
    520,075.70x = 780,113.55 × 485,083.70
  4. Step 4: Simplify right side
    520,075.70x = 378,420,367,254.14
  5. Step 5: Solve for x
    x = 378,420,367,254.14/520,075.70
  6. Step 6: Final answer
    x = 727,625.55

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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.