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Finding the Fourth Proportional to 161,689.74, 221,516 and 155,629.30

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Solution

The fourth proportional to 161,689.74, 221,516 and 155,629.30 is: 213,213.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    161,689.74 : 221,516 = 155,629.30 : x
  2. Step 2: Convert to fraction form
    161,689.74/221,516 = 155,629.30/x
  3. Step 3: Cross multiply
    161,689.74x = 221,516 × 155,629.30
  4. Step 4: Simplify right side
    161,689.74x = 34,474,380,018.80
  5. Step 5: Solve for x
    x = 34,474,380,018.80/161,689.74
  6. Step 6: Final answer
    x = 213,213.16

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.