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Finding the Fourth Proportional to 60,128.79, 90,192.24 and 20,686.25

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Solution

The fourth proportional to 60,128.79, 90,192.24 and 20,686.25 is: 31,029.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,128.79 : 90,192.24 = 20,686.25 : x
  2. Step 2: Convert to fraction form
    60,128.79/90,192.24 = 20,686.25/x
  3. Step 3: Cross multiply
    60,128.79x = 90,192.24 × 20,686.25
  4. Step 4: Simplify right side
    60,128.79x = 1,865,738,773.74
  5. Step 5: Solve for x
    x = 1,865,738,773.74/60,128.79
  6. Step 6: Final answer
    x = 31,029.04

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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.