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Finding the Fourth Proportional to 163,721.80, 245,582.70 and 84,860.20

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Solution

The fourth proportional to 163,721.80, 245,582.70 and 84,860.20 is: 127,290.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    163,721.80 : 245,582.70 = 84,860.20 : x
  2. Step 2: Convert to fraction form
    163,721.80/245,582.70 = 84,860.20/x
  3. Step 3: Cross multiply
    163,721.80x = 245,582.70 × 84,860.20
  4. Step 4: Simplify right side
    163,721.80x = 20,840,197,038.54
  5. Step 5: Solve for x
    x = 20,840,197,038.54/163,721.80
  6. Step 6: Final answer
    x = 127,290.30

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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.