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Finding the Fourth Proportional to 85,341.80, 128,012.70 and 54,199.40

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Solution

The fourth proportional to 85,341.80, 128,012.70 and 54,199.40 is: 81,299.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,341.80 : 128,012.70 = 54,199.40 : x
  2. Step 2: Convert to fraction form
    85,341.80/128,012.70 = 54,199.40/x
  3. Step 3: Cross multiply
    85,341.80x = 128,012.70 × 54,199.40
  4. Step 4: Simplify right side
    85,341.80x = 6,938,211,532.38
  5. Step 5: Solve for x
    x = 6,938,211,532.38/85,341.80
  6. Step 6: Final answer
    x = 81,299.10

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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.