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Finding the Fourth Proportional to 1,210,990.80, 1,813,861.80 and 1,001,038.80

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Solution

The fourth proportional to 1,210,990.80, 1,813,861.80 and 1,001,038.80 is: 1,499,388.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210,990.80 : 1,813,861.80 = 1,001,038.80 : x
  2. Step 2: Convert to fraction form
    1,210,990.80/1,813,861.80 = 1,001,038.80/x
  3. Step 3: Cross multiply
    1,210,990.80x = 1,813,861.80 × 1,001,038.80
  4. Step 4: Simplify right side
    1,210,990.80x = 1,815,746,039,637.84
  5. Step 5: Solve for x
    x = 1,815,746,039,637.84/1,210,990.80
  6. Step 6: Final answer
    x = 1,499,388.80

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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.