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Finding the Fourth Proportional to 1,215.16, 1,676.16 and 916.88

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Solution

The fourth proportional to 1,215.16, 1,676.16 and 916.88 is: 1,264.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.16 : 1,676.16 = 916.88 : x
  2. Step 2: Convert to fraction form
    1,215.16/1,676.16 = 916.88/x
  3. Step 3: Cross multiply
    1,215.16x = 1,676.16 × 916.88
  4. Step 4: Simplify right side
    1,215.16x = 1,536,829.20
  5. Step 5: Solve for x
    x = 1,536,829.20/1,215.16
  6. Step 6: Final answer
    x = 1,264.72

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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.