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Finding the Fourth Proportional to 389,513.79, 584,335.28 and 136,728.72

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Solution

The fourth proportional to 389,513.79, 584,335.28 and 136,728.72 is: 205,115.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,513.79 : 584,335.28 = 136,728.72 : x
  2. Step 2: Convert to fraction form
    389,513.79/584,335.28 = 136,728.72/x
  3. Step 3: Cross multiply
    389,513.79x = 584,335.28 × 136,728.72
  4. Step 4: Simplify right side
    389,513.79x = 79,895,415,227.06
  5. Step 5: Solve for x
    x = 79,895,415,227.06/389,513.79
  6. Step 6: Final answer
    x = 205,115.76

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.