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Finding the Fourth Proportional to 520,055.10, 780,082.65 and 425,576.70

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Solution

The fourth proportional to 520,055.10, 780,082.65 and 425,576.70 is: 638,365.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,055.10 : 780,082.65 = 425,576.70 : x
  2. Step 2: Convert to fraction form
    520,055.10/780,082.65 = 425,576.70/x
  3. Step 3: Cross multiply
    520,055.10x = 780,082.65 × 425,576.70
  4. Step 4: Simplify right side
    520,055.10x = 331,984,999,914.26
  5. Step 5: Solve for x
    x = 331,984,999,914.26/520,055.10
  6. Step 6: Final answer
    x = 638,365.05

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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.