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Finding the Fourth Proportional to 927.48, 1,280.39 and 717.18

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Solution

The fourth proportional to 927.48, 1,280.39 and 717.18 is: 990.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.48 : 1,280.39 = 717.18 : x
  2. Step 2: Convert to fraction form
    927.48/1,280.39 = 717.18/x
  3. Step 3: Cross multiply
    927.48x = 1,280.39 × 717.18
  4. Step 4: Simplify right side
    927.48x = 918,270.10
  5. Step 5: Solve for x
    x = 918,270.10/927.48
  6. Step 6: Final answer
    x = 990.07

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1.5x scale

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.