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Finding the Fourth Proportional to 258,040.80, 386,931.60 and 117,640.80

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Solution

The fourth proportional to 258,040.80, 386,931.60 and 117,640.80 is: 176,402.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,040.80 : 386,931.60 = 117,640.80 : x
  2. Step 2: Convert to fraction form
    258,040.80/386,931.60 = 117,640.80/x
  3. Step 3: Cross multiply
    258,040.80x = 386,931.60 × 117,640.80
  4. Step 4: Simplify right side
    258,040.80x = 45,518,942,969.28
  5. Step 5: Solve for x
    x = 45,518,942,969.28/258,040.80
  6. Step 6: Final answer
    x = 176,402.12

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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.