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Finding the Fourth Proportional to 390,077.40, 547,683 and 390,077.40

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Solution

The fourth proportional to 390,077.40, 547,683 and 390,077.40 is: 547,683

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,077.40 : 547,683 = 390,077.40 : x
  2. Step 2: Convert to fraction form
    390,077.40/547,683 = 390,077.40/x
  3. Step 3: Cross multiply
    390,077.40x = 547,683 × 390,077.40
  4. Step 4: Simplify right side
    390,077.40x = 213,638,760,664.20
  5. Step 5: Solve for x
    x = 213,638,760,664.20/390,077.40
  6. Step 6: Final answer
    x = 547,683

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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.