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Finding the Fourth Proportional to 338,440.80, 507,662.32 and 85,721.20

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Solution

The fourth proportional to 338,440.80, 507,662.32 and 85,721.20 is: 128,582.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    338,440.80 : 507,662.32 = 85,721.20 : x
  2. Step 2: Convert to fraction form
    338,440.80/507,662.32 = 85,721.20/x
  3. Step 3: Cross multiply
    338,440.80x = 507,662.32 × 85,721.20
  4. Step 4: Simplify right side
    338,440.80x = 43,517,423,265.18
  5. Step 5: Solve for x
    x = 43,517,423,265.18/338,440.80
  6. Step 6: Final answer
    x = 128,582.08

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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.