Home / 78,386.69-117,569.09-31,628.63

Finding the Fourth Proportional to 78,386.69, 117,569.09 and 31,628.63

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Solution

The fourth proportional to 78,386.69, 117,569.09 and 31,628.63 is: 47,438.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,386.69 : 117,569.09 = 31,628.63 : x
  2. Step 2: Convert to fraction form
    78,386.69/117,569.09 = 31,628.63/x
  3. Step 3: Cross multiply
    78,386.69x = 117,569.09 × 31,628.63
  4. Step 4: Simplify right side
    78,386.69x = 3,718,548,501.06
  5. Step 5: Solve for x
    x = 3,718,548,501.06/78,386.69
  6. Step 6: Final answer
    x = 47,438.52

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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.