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Finding the Fourth Proportional to 19,987.40, 29,864.18 and 19,987.40

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Solution

The fourth proportional to 19,987.40, 29,864.18 and 19,987.40 is: 29,864.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,987.40 : 29,864.18 = 19,987.40 : x
  2. Step 2: Convert to fraction form
    19,987.40/29,864.18 = 19,987.40/x
  3. Step 3: Cross multiply
    19,987.40x = 29,864.18 × 19,987.40
  4. Step 4: Simplify right side
    19,987.40x = 596,907,311.33
  5. Step 5: Solve for x
    x = 596,907,311.33/19,987.40
  6. Step 6: Final answer
    x = 29,864.18

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.