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Finding the Fourth Proportional to 390,047.80, 547,247.90 and 390,047.80

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Solution

The fourth proportional to 390,047.80, 547,247.90 and 390,047.80 is: 547,247.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,047.80 : 547,247.90 = 390,047.80 : x
  2. Step 2: Convert to fraction form
    390,047.80/547,247.90 = 390,047.80/x
  3. Step 3: Cross multiply
    390,047.80x = 547,247.90 × 390,047.80
  4. Step 4: Simplify right side
    390,047.80x = 213,452,839,449.62
  5. Step 5: Solve for x
    x = 213,452,839,449.62/390,047.80
  6. Step 6: Final answer
    x = 547,247.90

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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.