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Finding the Fourth Proportional to 85,470.30, 128,205.45 and 57,476.70

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Solution

The fourth proportional to 85,470.30, 128,205.45 and 57,476.70 is: 86,215.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,470.30 : 128,205.45 = 57,476.70 : x
  2. Step 2: Convert to fraction form
    85,470.30/128,205.45 = 57,476.70/x
  3. Step 3: Cross multiply
    85,470.30x = 128,205.45 × 57,476.70
  4. Step 4: Simplify right side
    85,470.30x = 7,368,826,188.02
  5. Step 5: Solve for x
    x = 7,368,826,188.02/85,470.30
  6. Step 6: Final answer
    x = 86,215.05

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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.