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Finding the Fourth Proportional to 529.92, 730.88 and 391.68

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Solution

The fourth proportional to 529.92, 730.88 and 391.68 is: 540.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    529.92 : 730.88 = 391.68 : x
  2. Step 2: Convert to fraction form
    529.92/730.88 = 391.68/x
  3. Step 3: Cross multiply
    529.92x = 730.88 × 391.68
  4. Step 4: Simplify right side
    529.92x = 286,271.08
  5. Step 5: Solve for x
    x = 286,271.08/529.92
  6. Step 6: Final answer
    x = 540.22

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.