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Finding the Fourth Proportional to 57,128.50, 85,674.50 and 19,679.58

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Solution

The fourth proportional to 57,128.50, 85,674.50 and 19,679.58 is: 29,513.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,128.50 : 85,674.50 = 19,679.58 : x
  2. Step 2: Convert to fraction form
    57,128.50/85,674.50 = 19,679.58/x
  3. Step 3: Cross multiply
    57,128.50x = 85,674.50 × 19,679.58
  4. Step 4: Simplify right side
    57,128.50x = 1,686,038,176.71
  5. Step 5: Solve for x
    x = 1,686,038,176.71/57,128.50
  6. Step 6: Final answer
    x = 29,513.08

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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.