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Finding the Fourth Proportional to 948.78, 1,421.31 and 915.18

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Solution

The fourth proportional to 948.78, 1,421.31 and 915.18 is: 1,370.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.78 : 1,421.31 = 915.18 : x
  2. Step 2: Convert to fraction form
    948.78/1,421.31 = 915.18/x
  3. Step 3: Cross multiply
    948.78x = 1,421.31 × 915.18
  4. Step 4: Simplify right side
    948.78x = 1,300,754.49
  5. Step 5: Solve for x
    x = 1,300,754.49/948.78
  6. Step 6: Final answer
    x = 1,370.98

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.