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Finding the Fourth Proportional to 916.60, 1,374.96 and 339.52

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Solution

The fourth proportional to 916.60, 1,374.96 and 339.52 is: 509.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.60 : 1,374.96 = 339.52 : x
  2. Step 2: Convert to fraction form
    916.60/1,374.96 = 339.52/x
  3. Step 3: Cross multiply
    916.60x = 1,374.96 × 339.52
  4. Step 4: Simplify right side
    916.60x = 466,826.42
  5. Step 5: Solve for x
    x = 466,826.42/916.60
  6. Step 6: Final answer
    x = 509.30

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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.