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Finding the Fourth Proportional to 285,372.24, 428,123.96 and 85,696.40

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Solution

The fourth proportional to 285,372.24, 428,123.96 and 85,696.40 is: 128,564.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,372.24 : 428,123.96 = 85,696.40 : x
  2. Step 2: Convert to fraction form
    285,372.24/428,123.96 = 85,696.40/x
  3. Step 3: Cross multiply
    285,372.24x = 428,123.96 × 85,696.40
  4. Step 4: Simplify right side
    285,372.24x = 36,688,679,556.64
  5. Step 5: Solve for x
    x = 36,688,679,556.64/285,372.24
  6. Step 6: Final answer
    x = 128,564.29

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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.