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Finding the Fourth Proportional to 927.60, 1,280.32 and 578.16

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Solution

The fourth proportional to 927.60, 1,280.32 and 578.16 is: 798.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.60 : 1,280.32 = 578.16 : x
  2. Step 2: Convert to fraction form
    927.60/1,280.32 = 578.16/x
  3. Step 3: Cross multiply
    927.60x = 1,280.32 × 578.16
  4. Step 4: Simplify right side
    927.60x = 740,229.81
  5. Step 5: Solve for x
    x = 740,229.81/927.60
  6. Step 6: Final answer
    x = 798.01

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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.