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Finding the Fourth Proportional to 172,281.10, 257,911.35 and 128,103.70

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Solution

The fourth proportional to 172,281.10, 257,911.35 and 128,103.70 is: 191,776.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,281.10 : 257,911.35 = 128,103.70 : x
  2. Step 2: Convert to fraction form
    172,281.10/257,911.35 = 128,103.70/x
  3. Step 3: Cross multiply
    172,281.10x = 257,911.35 × 128,103.70
  4. Step 4: Simplify right side
    172,281.10x = 33,039,398,207.00
  5. Step 5: Solve for x
    x = 33,039,398,207.00/172,281.10
  6. Step 6: Final answer
    x = 191,776.10

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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.