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Finding the Fourth Proportional to 21,001.30, 31,491.01 and 9,905.01

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Solution

The fourth proportional to 21,001.30, 31,491.01 and 9,905.01 is: 14,852.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,001.30 : 31,491.01 = 9,905.01 : x
  2. Step 2: Convert to fraction form
    21,001.30/31,491.01 = 9,905.01/x
  3. Step 3: Cross multiply
    21,001.30x = 31,491.01 × 9,905.01
  4. Step 4: Simplify right side
    21,001.30x = 311,918,611.51
  5. Step 5: Solve for x
    x = 311,918,611.51/21,001.30
  6. Step 6: Final answer
    x = 14,852.35

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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.