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Finding the Fourth Proportional to 1,139, 1,707.72 and 619.80

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Solution

The fourth proportional to 1,139, 1,707.72 and 619.80 is: 929.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139 : 1,707.72 = 619.80 : x
  2. Step 2: Convert to fraction form
    1,139/1,707.72 = 619.80/x
  3. Step 3: Cross multiply
    1,139x = 1,707.72 × 619.80
  4. Step 4: Simplify right side
    1,139x = 1,058,444.86
  5. Step 5: Solve for x
    x = 1,058,444.86/1,139
  6. Step 6: Final answer
    x = 929.28

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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.