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Finding the Fourth Proportional to 31,390.86, 43,326.86 and 17,969.87

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Solution

The fourth proportional to 31,390.86, 43,326.86 and 17,969.87 is: 24,802.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,390.86 : 43,326.86 = 17,969.87 : x
  2. Step 2: Convert to fraction form
    31,390.86/43,326.86 = 17,969.87/x
  3. Step 3: Cross multiply
    31,390.86x = 43,326.86 × 17,969.87
  4. Step 4: Simplify right side
    31,390.86x = 778,578,041.71
  5. Step 5: Solve for x
    x = 778,578,041.71/31,390.86
  6. Step 6: Final answer
    x = 24,802.70

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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.