Home / 78,728.10-118,106.55-31,985.70

Finding the Fourth Proportional to 78,728.10, 118,106.55 and 31,985.70

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Solution

The fourth proportional to 78,728.10, 118,106.55 and 31,985.70 is: 47,984.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,728.10 : 118,106.55 = 31,985.70 : x
  2. Step 2: Convert to fraction form
    78,728.10/118,106.55 = 31,985.70/x
  3. Step 3: Cross multiply
    78,728.10x = 118,106.55 × 31,985.70
  4. Step 4: Simplify right side
    78,728.10x = 3,777,720,676.34
  5. Step 5: Solve for x
    x = 3,777,720,676.34/78,728.10
  6. Step 6: Final answer
    x = 47,984.40

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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.