Home / 78,721.12-118,122.40-31,326

Finding the Fourth Proportional to 78,721.12, 118,122.40 and 31,326

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Solution

The fourth proportional to 78,721.12, 118,122.40 and 31,326 is: 47,005.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,721.12 : 118,122.40 = 31,326 : x
  2. Step 2: Convert to fraction form
    78,721.12/118,122.40 = 31,326/x
  3. Step 3: Cross multiply
    78,721.12x = 118,122.40 × 31,326
  4. Step 4: Simplify right side
    78,721.12x = 3,700,302,302.40
  5. Step 5: Solve for x
    x = 3,700,302,302.40/78,721.12
  6. Step 6: Final answer
    x = 47,005.20

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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.