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Finding the Fourth Proportional to 1,072.93, 1,484.67 and 915.31

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Solution

The fourth proportional to 1,072.93, 1,484.67 and 915.31 is: 1,266.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,072.93 : 1,484.67 = 915.31 : x
  2. Step 2: Convert to fraction form
    1,072.93/1,484.67 = 915.31/x
  3. Step 3: Cross multiply
    1,072.93x = 1,484.67 × 915.31
  4. Step 4: Simplify right side
    1,072.93x = 1,358,925.87
  5. Step 5: Solve for x
    x = 1,358,925.87/1,072.93
  6. Step 6: Final answer
    x = 1,266.56

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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.