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Finding the Fourth Proportional to 390,403.71, 538,785.18 and 237,413.52

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Solution

The fourth proportional to 390,403.71, 538,785.18 and 237,413.52 is: 327,647.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,403.71 : 538,785.18 = 237,413.52 : x
  2. Step 2: Convert to fraction form
    390,403.71/538,785.18 = 237,413.52/x
  3. Step 3: Cross multiply
    390,403.71x = 538,785.18 × 237,413.52
  4. Step 4: Simplify right side
    390,403.71x = 127,914,886,107.63
  5. Step 5: Solve for x
    x = 127,914,886,107.63/390,403.71
  6. Step 6: Final answer
    x = 327,647.72

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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.