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Finding the Fourth Proportional to 219,019.60, 328,529.40 and 85,904.20

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Solution

The fourth proportional to 219,019.60, 328,529.40 and 85,904.20 is: 128,856.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,019.60 : 328,529.40 = 85,904.20 : x
  2. Step 2: Convert to fraction form
    219,019.60/328,529.40 = 85,904.20/x
  3. Step 3: Cross multiply
    219,019.60x = 328,529.40 × 85,904.20
  4. Step 4: Simplify right side
    219,019.60x = 28,222,055,283.48
  5. Step 5: Solve for x
    x = 28,222,055,283.48/219,019.60
  6. Step 6: Final answer
    x = 128,856.30

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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.