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Finding the Fourth Proportional to 1,209,015, 1,668,440.70 and 665,139.15

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Solution

The fourth proportional to 1,209,015, 1,668,440.70 and 665,139.15 is: 917,892.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209,015 : 1,668,440.70 = 665,139.15 : x
  2. Step 2: Convert to fraction form
    1,209,015/1,668,440.70 = 665,139.15/x
  3. Step 3: Cross multiply
    1,209,015x = 1,668,440.70 × 665,139.15
  4. Step 4: Simplify right side
    1,209,015x = 1,109,745,225,697.71
  5. Step 5: Solve for x
    x = 1,109,745,225,697.71/1,209,015
  6. Step 6: Final answer
    x = 917,892.02

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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.