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Finding the Fourth Proportional to 390,025.80, 547,217.10 and 390,025.80

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Solution

The fourth proportional to 390,025.80, 547,217.10 and 390,025.80 is: 547,217.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,025.80 : 547,217.10 = 390,025.80 : x
  2. Step 2: Convert to fraction form
    390,025.80/547,217.10 = 390,025.80/x
  3. Step 3: Cross multiply
    390,025.80x = 547,217.10 × 390,025.80
  4. Step 4: Simplify right side
    390,025.80x = 213,428,787,201.18
  5. Step 5: Solve for x
    x = 213,428,787,201.18/390,025.80
  6. Step 6: Final answer
    x = 547,217.10

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1.5x scale

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.