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Finding the Fourth Proportional to 999.17, 1,376.91 and 718.91

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Solution

The fourth proportional to 999.17, 1,376.91 and 718.91 is: 990.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.17 : 1,376.91 = 718.91 : x
  2. Step 2: Convert to fraction form
    999.17/1,376.91 = 718.91/x
  3. Step 3: Cross multiply
    999.17x = 1,376.91 × 718.91
  4. Step 4: Simplify right side
    999.17x = 989,877.81
  5. Step 5: Solve for x
    x = 989,877.81/999.17
  6. Step 6: Final answer
    x = 990.70

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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.