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Finding the Fourth Proportional to 390,806.10, 548,372.70 and 390,806.10

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Solution

The fourth proportional to 390,806.10, 548,372.70 and 390,806.10 is: 548,372.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,806.10 : 548,372.70 = 390,806.10 : x
  2. Step 2: Convert to fraction form
    390,806.10/548,372.70 = 390,806.10/x
  3. Step 3: Cross multiply
    390,806.10x = 548,372.70 × 390,806.10
  4. Step 4: Simplify right side
    390,806.10x = 214,307,396,233.47
  5. Step 5: Solve for x
    x = 214,307,396,233.47/390,806.10
  6. Step 6: Final answer
    x = 548,372.70

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.