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Finding the Fourth Proportional to 916.68, 1,381.80 and 903.72

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Solution

The fourth proportional to 916.68, 1,381.80 and 903.72 is: 1,362.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.68 : 1,381.80 = 903.72 : x
  2. Step 2: Convert to fraction form
    916.68/1,381.80 = 903.72/x
  3. Step 3: Cross multiply
    916.68x = 1,381.80 × 903.72
  4. Step 4: Simplify right side
    916.68x = 1,248,760.30
  5. Step 5: Solve for x
    x = 1,248,760.30/916.68
  6. Step 6: Final answer
    x = 1,362.26

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.