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Finding the Fourth Proportional to 91,328.78, 136,993.41 and 28,146.87

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Solution

The fourth proportional to 91,328.78, 136,993.41 and 28,146.87 is: 42,220.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,328.78 : 136,993.41 = 28,146.87 : x
  2. Step 2: Convert to fraction form
    91,328.78/136,993.41 = 28,146.87/x
  3. Step 3: Cross multiply
    91,328.78x = 136,993.41 × 28,146.87
  4. Step 4: Simplify right side
    91,328.78x = 3,855,935,702.13
  5. Step 5: Solve for x
    x = 3,855,935,702.13/91,328.78
  6. Step 6: Final answer
    x = 42,220.38

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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.