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Finding the Fourth Proportional to 144,709.40, 217,064.10 and 85,611.80

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Solution

The fourth proportional to 144,709.40, 217,064.10 and 85,611.80 is: 128,417.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    144,709.40 : 217,064.10 = 85,611.80 : x
  2. Step 2: Convert to fraction form
    144,709.40/217,064.10 = 85,611.80/x
  3. Step 3: Cross multiply
    144,709.40x = 217,064.10 × 85,611.80
  4. Step 4: Simplify right side
    144,709.40x = 18,583,248,316.38
  5. Step 5: Solve for x
    x = 18,583,248,316.38/144,709.40
  6. Step 6: Final answer
    x = 128,417.70

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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.