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Finding the Fourth Proportional to 615.76, 920.80 and 451.72

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Solution

The fourth proportional to 615.76, 920.80 and 451.72 is: 675.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.76 : 920.80 = 451.72 : x
  2. Step 2: Convert to fraction form
    615.76/920.80 = 451.72/x
  3. Step 3: Cross multiply
    615.76x = 920.80 × 451.72
  4. Step 4: Simplify right side
    615.76x = 415,943.78
  5. Step 5: Solve for x
    x = 415,943.78/615.76
  6. Step 6: Final answer
    x = 675.50

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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.