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Finding the Fourth Proportional to 915.66, 1,263.67 and 718.83

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Solution

The fourth proportional to 915.66, 1,263.67 and 718.83 is: 992.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.66 : 1,263.67 = 718.83 : x
  2. Step 2: Convert to fraction form
    915.66/1,263.67 = 718.83/x
  3. Step 3: Cross multiply
    915.66x = 1,263.67 × 718.83
  4. Step 4: Simplify right side
    915.66x = 908,362.11
  5. Step 5: Solve for x
    x = 908,362.11/915.66
  6. Step 6: Final answer
    x = 992.03

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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.