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Finding the Fourth Proportional to 20,886.30, 31,329.45 and 19,914.30

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Solution

The fourth proportional to 20,886.30, 31,329.45 and 19,914.30 is: 29,871.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,886.30 : 31,329.45 = 19,914.30 : x
  2. Step 2: Convert to fraction form
    20,886.30/31,329.45 = 19,914.30/x
  3. Step 3: Cross multiply
    20,886.30x = 31,329.45 × 19,914.30
  4. Step 4: Simplify right side
    20,886.30x = 623,904,066.14
  5. Step 5: Solve for x
    x = 623,904,066.14/20,886.30
  6. Step 6: Final answer
    x = 29,871.45

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1.5x scale

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.