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Finding the Fourth Proportional to 916.88, 1,375.32 and 339.75

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Solution

The fourth proportional to 916.88, 1,375.32 and 339.75 is: 509.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.88 : 1,375.32 = 339.75 : x
  2. Step 2: Convert to fraction form
    916.88/1,375.32 = 339.75/x
  3. Step 3: Cross multiply
    916.88x = 1,375.32 × 339.75
  4. Step 4: Simplify right side
    916.88x = 467,264.97
  5. Step 5: Solve for x
    x = 467,264.97/916.88
  6. Step 6: Final answer
    x = 509.63

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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.