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Finding the Fourth Proportional to 928.50, 1,280.44 and 718.35

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Solution

The fourth proportional to 928.50, 1,280.44 and 718.35 is: 990.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.50 : 1,280.44 = 718.35 : x
  2. Step 2: Convert to fraction form
    928.50/1,280.44 = 718.35/x
  3. Step 3: Cross multiply
    928.50x = 1,280.44 × 718.35
  4. Step 4: Simplify right side
    928.50x = 919,804.07
  5. Step 5: Solve for x
    x = 919,804.07/928.50
  6. Step 6: Final answer
    x = 990.63

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.