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Finding the Fourth Proportional to 925.76, 1,389.48 and 493.28

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Solution

The fourth proportional to 925.76, 1,389.48 and 493.28 is: 740.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.76 : 1,389.48 = 493.28 : x
  2. Step 2: Convert to fraction form
    925.76/1,389.48 = 493.28/x
  3. Step 3: Cross multiply
    925.76x = 1,389.48 × 493.28
  4. Step 4: Simplify right side
    925.76x = 685,402.69
  5. Step 5: Solve for x
    x = 685,402.69/925.76
  6. Step 6: Final answer
    x = 740.37

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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.