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Finding the Fourth Proportional to 1,605.28, 2,406.84 and 783.40

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Solution

The fourth proportional to 1,605.28, 2,406.84 and 783.40 is: 1,174.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,605.28 : 2,406.84 = 783.40 : x
  2. Step 2: Convert to fraction form
    1,605.28/2,406.84 = 783.40/x
  3. Step 3: Cross multiply
    1,605.28x = 2,406.84 × 783.40
  4. Step 4: Simplify right side
    1,605.28x = 1,885,518.46
  5. Step 5: Solve for x
    x = 1,885,518.46/1,605.28
  6. Step 6: Final answer
    x = 1,174.57

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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.