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Finding the Fourth Proportional to 718.12, 989.70 and 521.32

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Solution

The fourth proportional to 718.12, 989.70 and 521.32 is: 718.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.12 : 989.70 = 521.32 : x
  2. Step 2: Convert to fraction form
    718.12/989.70 = 521.32/x
  3. Step 3: Cross multiply
    718.12x = 989.70 × 521.32
  4. Step 4: Simplify right side
    718.12x = 515,950.40
  5. Step 5: Solve for x
    x = 515,950.40/718.12
  6. Step 6: Final answer
    x = 718.47

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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.