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Finding the Fourth Proportional to 129,785.60, 194,678.40 and 85,462.40

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Solution

The fourth proportional to 129,785.60, 194,678.40 and 85,462.40 is: 128,193.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,785.60 : 194,678.40 = 85,462.40 : x
  2. Step 2: Convert to fraction form
    129,785.60/194,678.40 = 85,462.40/x
  3. Step 3: Cross multiply
    129,785.60x = 194,678.40 × 85,462.40
  4. Step 4: Simplify right side
    129,785.60x = 16,637,683,292.16
  5. Step 5: Solve for x
    x = 16,637,683,292.16/129,785.60
  6. Step 6: Final answer
    x = 128,193.60

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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.