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Finding the Fourth Proportional to 210,381.80, 315,419.10 and 85,658.60

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Solution

The fourth proportional to 210,381.80, 315,419.10 and 85,658.60 is: 128,425.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,381.80 : 315,419.10 = 85,658.60 : x
  2. Step 2: Convert to fraction form
    210,381.80/315,419.10 = 85,658.60/x
  3. Step 3: Cross multiply
    210,381.80x = 315,419.10 × 85,658.60
  4. Step 4: Simplify right side
    210,381.80x = 27,018,358,519.26
  5. Step 5: Solve for x
    x = 27,018,358,519.26/210,381.80
  6. Step 6: Final answer
    x = 128,425.36

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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.