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Finding the Fourth Proportional to 390,072.40, 547,676 and 390,072.40

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Solution

The fourth proportional to 390,072.40, 547,676 and 390,072.40 is: 547,676

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,072.40 : 547,676 = 390,072.40 : x
  2. Step 2: Convert to fraction form
    390,072.40/547,676 = 390,072.40/x
  3. Step 3: Cross multiply
    390,072.40x = 547,676 × 390,072.40
  4. Step 4: Simplify right side
    390,072.40x = 213,633,291,742.40
  5. Step 5: Solve for x
    x = 213,633,291,742.40/390,072.40
  6. Step 6: Final answer
    x = 547,676

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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.