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Finding the Fourth Proportional to 8,665.47, 11,957.63 and 5,128.07

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Solution

The fourth proportional to 8,665.47, 11,957.63 and 5,128.07 is: 7,076.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,665.47 : 11,957.63 = 5,128.07 : x
  2. Step 2: Convert to fraction form
    8,665.47/11,957.63 = 5,128.07/x
  3. Step 3: Cross multiply
    8,665.47x = 11,957.63 × 5,128.07
  4. Step 4: Simplify right side
    8,665.47x = 61,319,478.25
  5. Step 5: Solve for x
    x = 61,319,478.25/8,665.47
  6. Step 6: Final answer
    x = 7,076.30

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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.