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Finding the Fourth Proportional to 78,720.80, 118,004.40 and 70,426.40

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Solution

The fourth proportional to 78,720.80, 118,004.40 and 70,426.40 is: 105,570.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,720.80 : 118,004.40 = 70,426.40 : x
  2. Step 2: Convert to fraction form
    78,720.80/118,004.40 = 70,426.40/x
  3. Step 3: Cross multiply
    78,720.80x = 118,004.40 × 70,426.40
  4. Step 4: Simplify right side
    78,720.80x = 8,310,625,076.16
  5. Step 5: Solve for x
    x = 8,310,625,076.16/78,720.80
  6. Step 6: Final answer
    x = 105,570.89

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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.