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Finding the Fourth Proportional to 9,270, 12,792.72 and 5,078.40

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Solution

The fourth proportional to 9,270, 12,792.72 and 5,078.40 is: 7,008.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,270 : 12,792.72 = 5,078.40 : x
  2. Step 2: Convert to fraction form
    9,270/12,792.72 = 5,078.40/x
  3. Step 3: Cross multiply
    9,270x = 12,792.72 × 5,078.40
  4. Step 4: Simplify right side
    9,270x = 64,966,549.25
  5. Step 5: Solve for x
    x = 64,966,549.25/9,270
  6. Step 6: Final answer
    x = 7,008.26

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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.