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Finding the Fourth Proportional to 916.20, 1,374.94 and 339.56

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Solution

The fourth proportional to 916.20, 1,374.94 and 339.56 is: 509.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.20 : 1,374.94 = 339.56 : x
  2. Step 2: Convert to fraction form
    916.20/1,374.94 = 339.56/x
  3. Step 3: Cross multiply
    916.20x = 1,374.94 × 339.56
  4. Step 4: Simplify right side
    916.20x = 466,874.63
  5. Step 5: Solve for x
    x = 466,874.63/916.20
  6. Step 6: Final answer
    x = 509.58

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Double scale
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1.5x scale

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.