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Finding the Fourth Proportional to 916.18, 1,374.95 and 682.45

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Solution

The fourth proportional to 916.18, 1,374.95 and 682.45 is: 1,024.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.18 : 1,374.95 = 682.45 : x
  2. Step 2: Convert to fraction form
    916.18/1,374.95 = 682.45/x
  3. Step 3: Cross multiply
    916.18x = 1,374.95 × 682.45
  4. Step 4: Simplify right side
    916.18x = 938,332.90
  5. Step 5: Solve for x
    x = 938,332.90/916.18
  6. Step 6: Final answer
    x = 1,024.18

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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.