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Finding the Fourth Proportional to 718.81, 992.29 and 509.15

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Solution

The fourth proportional to 718.81, 992.29 and 509.15 is: 702.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.81 : 992.29 = 509.15 : x
  2. Step 2: Convert to fraction form
    718.81/992.29 = 509.15/x
  3. Step 3: Cross multiply
    718.81x = 992.29 × 509.15
  4. Step 4: Simplify right side
    718.81x = 505,225.66
  5. Step 5: Solve for x
    x = 505,225.66/718.81
  6. Step 6: Final answer
    x = 702.87

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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.