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Finding the Fourth Proportional to 529.29, 729.55 and 485.17

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Solution

The fourth proportional to 529.29, 729.55 and 485.17 is: 668.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    529.29 : 729.55 = 485.17 : x
  2. Step 2: Convert to fraction form
    529.29/729.55 = 485.17/x
  3. Step 3: Cross multiply
    529.29x = 729.55 × 485.17
  4. Step 4: Simplify right side
    529.29x = 353,955.77
  5. Step 5: Solve for x
    x = 353,955.77/529.29
  6. Step 6: Final answer
    x = 668.74

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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.