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Finding the Fourth Proportional to 386,285.80, 579,428.70 and 136,935.40

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Solution

The fourth proportional to 386,285.80, 579,428.70 and 136,935.40 is: 205,403.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,285.80 : 579,428.70 = 136,935.40 : x
  2. Step 2: Convert to fraction form
    386,285.80/579,428.70 = 136,935.40/x
  3. Step 3: Cross multiply
    386,285.80x = 579,428.70 × 136,935.40
  4. Step 4: Simplify right side
    386,285.80x = 79,344,300,805.98
  5. Step 5: Solve for x
    x = 79,344,300,805.98/386,285.80
  6. Step 6: Final answer
    x = 205,403.10

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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.