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Finding the Fourth Proportional to 1,209,663.12, 1,669,357.92 and 665,795.08

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Solution

The fourth proportional to 1,209,663.12, 1,669,357.92 and 665,795.08 is: 918,809.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209,663.12 : 1,669,357.92 = 665,795.08 : x
  2. Step 2: Convert to fraction form
    1,209,663.12/1,669,357.92 = 665,795.08/x
  3. Step 3: Cross multiply
    1,209,663.12x = 1,669,357.92 × 665,795.08
  4. Step 4: Simplify right side
    1,209,663.12x = 1,111,450,289,895.03
  5. Step 5: Solve for x
    x = 1,111,450,289,895.03/1,209,663.12
  6. Step 6: Final answer
    x = 918,809.77

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.