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Finding the Fourth Proportional to 485,428.51, 728,142.13 and 130,442.54

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Solution

The fourth proportional to 485,428.51, 728,142.13 and 130,442.54 is: 195,663.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,428.51 : 728,142.13 = 130,442.54 : x
  2. Step 2: Convert to fraction form
    485,428.51/728,142.13 = 130,442.54/x
  3. Step 3: Cross multiply
    485,428.51x = 728,142.13 × 130,442.54
  4. Step 4: Simplify right side
    485,428.51x = 94,980,708,918.21
  5. Step 5: Solve for x
    x = 94,980,708,918.21/485,428.51
  6. Step 6: Final answer
    x = 195,663.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.