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Finding the Fourth Proportional to 85,700.20, 128,550.30 and 83,950.60

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Solution

The fourth proportional to 85,700.20, 128,550.30 and 83,950.60 is: 125,925.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,700.20 : 128,550.30 = 83,950.60 : x
  2. Step 2: Convert to fraction form
    85,700.20/128,550.30 = 83,950.60/x
  3. Step 3: Cross multiply
    85,700.20x = 128,550.30 × 83,950.60
  4. Step 4: Simplify right side
    85,700.20x = 10,791,874,815.18
  5. Step 5: Solve for x
    x = 10,791,874,815.18/85,700.20
  6. Step 6: Final answer
    x = 125,925.90

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1.5x scale

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.