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Finding the Fourth Proportional to 916.19, 1,263.44 and 840.30

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Solution

The fourth proportional to 916.19, 1,263.44 and 840.30 is: 1,158.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.19 : 1,263.44 = 840.30 : x
  2. Step 2: Convert to fraction form
    916.19/1,263.44 = 840.30/x
  3. Step 3: Cross multiply
    916.19x = 1,263.44 × 840.30
  4. Step 4: Simplify right side
    916.19x = 1,061,664.43
  5. Step 5: Solve for x
    x = 1,061,664.43/916.19
  6. Step 6: Final answer
    x = 1,158.79

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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.