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Finding the Fourth Proportional to 219,056.88, 328,585.32 and 85,999.80

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Solution

The fourth proportional to 219,056.88, 328,585.32 and 85,999.80 is: 128,999.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,056.88 : 328,585.32 = 85,999.80 : x
  2. Step 2: Convert to fraction form
    219,056.88/328,585.32 = 85,999.80/x
  3. Step 3: Cross multiply
    219,056.88x = 328,585.32 × 85,999.80
  4. Step 4: Simplify right side
    219,056.88x = 28,258,271,802.94
  5. Step 5: Solve for x
    x = 28,258,271,802.94/219,056.88
  6. Step 6: Final answer
    x = 128,999.70

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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.