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Finding the Fourth Proportional to 114,979.20, 172,468.80 and 103,315.20

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Solution

The fourth proportional to 114,979.20, 172,468.80 and 103,315.20 is: 154,972.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    114,979.20 : 172,468.80 = 103,315.20 : x
  2. Step 2: Convert to fraction form
    114,979.20/172,468.80 = 103,315.20/x
  3. Step 3: Cross multiply
    114,979.20x = 172,468.80 × 103,315.20
  4. Step 4: Simplify right side
    114,979.20x = 17,818,648,565.76
  5. Step 5: Solve for x
    x = 17,818,648,565.76/114,979.20
  6. Step 6: Final answer
    x = 154,972.80

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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.