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Finding the Fourth Proportional to 619,428.90, 855,178.32 and 390,182.70

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Solution

The fourth proportional to 619,428.90, 855,178.32 and 390,182.70 is: 538,682.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    619,428.90 : 855,178.32 = 390,182.70 : x
  2. Step 2: Convert to fraction form
    619,428.90/855,178.32 = 390,182.70/x
  3. Step 3: Cross multiply
    619,428.90x = 855,178.32 × 390,182.70
  4. Step 4: Simplify right side
    619,428.90x = 333,675,790,549.17
  5. Step 5: Solve for x
    x = 333,675,790,549.17/619,428.90
  6. Step 6: Final answer
    x = 538,682.95

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.