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Finding the Fourth Proportional to 520,075.10, 780,112.65 and 431,428.70

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Solution

The fourth proportional to 520,075.10, 780,112.65 and 431,428.70 is: 647,143.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,075.10 : 780,112.65 = 431,428.70 : x
  2. Step 2: Convert to fraction form
    520,075.10/780,112.65 = 431,428.70/x
  3. Step 3: Cross multiply
    520,075.10x = 780,112.65 × 431,428.70
  4. Step 4: Simplify right side
    520,075.10x = 336,562,986,443.06
  5. Step 5: Solve for x
    x = 336,562,986,443.06/520,075.10
  6. Step 6: Final answer
    x = 647,143.05

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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.