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Finding the Fourth Proportional to 916.76, 1,375.42 and 339.50

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Solution

The fourth proportional to 916.76, 1,375.42 and 339.50 is: 509.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.76 : 1,375.42 = 339.50 : x
  2. Step 2: Convert to fraction form
    916.76/1,375.42 = 339.50/x
  3. Step 3: Cross multiply
    916.76x = 1,375.42 × 339.50
  4. Step 4: Simplify right side
    916.76x = 466,955.09
  5. Step 5: Solve for x
    x = 466,955.09/916.76
  6. Step 6: Final answer
    x = 509.35

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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.