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Finding the Fourth Proportional to 85,877.70, 128,816.55 and 80,045.70

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Solution

The fourth proportional to 85,877.70, 128,816.55 and 80,045.70 is: 120,068.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,877.70 : 128,816.55 = 80,045.70 : x
  2. Step 2: Convert to fraction form
    85,877.70/128,816.55 = 80,045.70/x
  3. Step 3: Cross multiply
    85,877.70x = 128,816.55 × 80,045.70
  4. Step 4: Simplify right side
    85,877.70x = 10,311,210,916.34
  5. Step 5: Solve for x
    x = 10,311,210,916.34/85,877.70
  6. Step 6: Final answer
    x = 120,068.55

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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.