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Finding the Fourth Proportional to 520,245, 717,938.10 and 281,781

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Solution

The fourth proportional to 520,245, 717,938.10 and 281,781 is: 388,857.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,245 : 717,938.10 = 281,781 : x
  2. Step 2: Convert to fraction form
    520,245/717,938.10 = 281,781/x
  3. Step 3: Cross multiply
    520,245x = 717,938.10 × 281,781
  4. Step 4: Simplify right side
    520,245x = 202,301,315,756.10
  5. Step 5: Solve for x
    x = 202,301,315,756.10/520,245
  6. Step 6: Final answer
    x = 388,857.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.