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Finding the Fourth Proportional to 282,387.79, 389,695.62 and 155,071.45

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Solution

The fourth proportional to 282,387.79, 389,695.62 and 155,071.45 is: 213,998.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    282,387.79 : 389,695.62 = 155,071.45 : x
  2. Step 2: Convert to fraction form
    282,387.79/389,695.62 = 155,071.45/x
  3. Step 3: Cross multiply
    282,387.79x = 389,695.62 × 155,071.45
  4. Step 4: Simplify right side
    282,387.79x = 60,430,664,852.05
  5. Step 5: Solve for x
    x = 60,430,664,852.05/282,387.79
  6. Step 6: Final answer
    x = 213,998.86

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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.