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Finding the Fourth Proportional to 1,397,490.50, 1,928,605.32 and 785,835.81

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Solution

The fourth proportional to 1,397,490.50, 1,928,605.32 and 785,835.81 is: 1,084,491.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,397,490.50 : 1,928,605.32 = 785,835.81 : x
  2. Step 2: Convert to fraction form
    1,397,490.50/1,928,605.32 = 785,835.81/x
  3. Step 3: Cross multiply
    1,397,490.50x = 1,928,605.32 × 785,835.81
  4. Step 4: Simplify right side
    1,397,490.50x = 1,515,567,123,812.51
  5. Step 5: Solve for x
    x = 1,515,567,123,812.51/1,397,490.50
  6. Step 6: Final answer
    x = 1,084,491.90

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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.