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Finding the Fourth Proportional to 282,390.40, 389,673.36 and 155,063.20

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Solution

The fourth proportional to 282,390.40, 389,673.36 and 155,063.20 is: 213,973.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    282,390.40 : 389,673.36 = 155,063.20 : x
  2. Step 2: Convert to fraction form
    282,390.40/389,673.36 = 155,063.20/x
  3. Step 3: Cross multiply
    282,390.40x = 389,673.36 × 155,063.20
  4. Step 4: Simplify right side
    282,390.40x = 60,423,998,156.35
  5. Step 5: Solve for x
    x = 60,423,998,156.35/282,390.40
  6. Step 6: Final answer
    x = 213,973.27

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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.