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Finding the Fourth Proportional to 78,661.80, 108,337.50 and 77,203.80

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Solution

The fourth proportional to 78,661.80, 108,337.50 and 77,203.80 is: 106,329.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,661.80 : 108,337.50 = 77,203.80 : x
  2. Step 2: Convert to fraction form
    78,661.80/108,337.50 = 77,203.80/x
  3. Step 3: Cross multiply
    78,661.80x = 108,337.50 × 77,203.80
  4. Step 4: Simplify right side
    78,661.80x = 8,364,066,682.50
  5. Step 5: Solve for x
    x = 8,364,066,682.50/78,661.80
  6. Step 6: Final answer
    x = 106,329.46

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.