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Finding the Fourth Proportional to 718.35, 989.49 and 508.15

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Solution

The fourth proportional to 718.35, 989.49 and 508.15 is: 699.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.35 : 989.49 = 508.15 : x
  2. Step 2: Convert to fraction form
    718.35/989.49 = 508.15/x
  3. Step 3: Cross multiply
    718.35x = 989.49 × 508.15
  4. Step 4: Simplify right side
    718.35x = 502,809.34
  5. Step 5: Solve for x
    x = 502,809.34/718.35
  6. Step 6: Final answer
    x = 699.95

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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.