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Finding the Fourth Proportional to 1,605.80, 2,407.76 and 783.24

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Solution

The fourth proportional to 1,605.80, 2,407.76 and 783.24 is: 1,174.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,605.80 : 2,407.76 = 783.24 : x
  2. Step 2: Convert to fraction form
    1,605.80/2,407.76 = 783.24/x
  3. Step 3: Cross multiply
    1,605.80x = 2,407.76 × 783.24
  4. Step 4: Simplify right side
    1,605.80x = 1,885,853.94
  5. Step 5: Solve for x
    x = 1,885,853.94/1,605.80
  6. Step 6: Final answer
    x = 1,174.40

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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.