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Finding the Fourth Proportional to 153,138.20, 211,280.20 and 92,685.87

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Solution

The fourth proportional to 153,138.20, 211,280.20 and 92,685.87 is: 127,875.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,138.20 : 211,280.20 = 92,685.87 : x
  2. Step 2: Convert to fraction form
    153,138.20/211,280.20 = 92,685.87/x
  3. Step 3: Cross multiply
    153,138.20x = 211,280.20 × 92,685.87
  4. Step 4: Simplify right side
    153,138.20x = 19,582,688,919.06
  5. Step 5: Solve for x
    x = 19,582,688,919.06/153,138.20
  6. Step 6: Final answer
    x = 127,875.93

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.