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Finding the Fourth Proportional to 389,509.68, 584,329.10 and 136,724.58

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Solution

The fourth proportional to 389,509.68, 584,329.10 and 136,724.58 is: 205,109.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,509.68 : 584,329.10 = 136,724.58 : x
  2. Step 2: Convert to fraction form
    389,509.68/584,329.10 = 136,724.58/x
  3. Step 3: Cross multiply
    389,509.68x = 584,329.10 × 136,724.58
  4. Step 4: Simplify right side
    389,509.68x = 79,892,150,095.66
  5. Step 5: Solve for x
    x = 79,892,150,095.66/389,509.68
  6. Step 6: Final answer
    x = 205,109.53

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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.