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Finding the Fourth Proportional to 21,001.59, 31,491.44 and 9,905.30

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Solution

The fourth proportional to 21,001.59, 31,491.44 and 9,905.30 is: 14,852.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,001.59 : 31,491.44 = 9,905.30 : x
  2. Step 2: Convert to fraction form
    21,001.59/31,491.44 = 9,905.30/x
  3. Step 3: Cross multiply
    21,001.59x = 31,491.44 × 9,905.30
  4. Step 4: Simplify right side
    21,001.59x = 311,931,953.65
  5. Step 5: Solve for x
    x = 311,931,953.65/21,001.59
  6. Step 6: Final answer
    x = 14,852.78

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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.