Home / 78,780.28-118,071.86-39,348.40

Finding the Fourth Proportional to 78,780.28, 118,071.86 and 39,348.40

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Solution

The fourth proportional to 78,780.28, 118,071.86 and 39,348.40 is: 58,973.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,780.28 : 118,071.86 = 39,348.40 : x
  2. Step 2: Convert to fraction form
    78,780.28/118,071.86 = 39,348.40/x
  3. Step 3: Cross multiply
    78,780.28x = 118,071.86 × 39,348.40
  4. Step 4: Simplify right side
    78,780.28x = 4,645,938,776.02
  5. Step 5: Solve for x
    x = 4,645,938,776.02/78,780.28
  6. Step 6: Final answer
    x = 58,973.37

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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.