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Finding the Fourth Proportional to 929.28, 1,391.60 and 603.68

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Solution

The fourth proportional to 929.28, 1,391.60 and 603.68 is: 904.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.28 : 1,391.60 = 603.68 : x
  2. Step 2: Convert to fraction form
    929.28/1,391.60 = 603.68/x
  3. Step 3: Cross multiply
    929.28x = 1,391.60 × 603.68
  4. Step 4: Simplify right side
    929.28x = 840,081.09
  5. Step 5: Solve for x
    x = 840,081.09/929.28
  6. Step 6: Final answer
    x = 904.01

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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.