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Finding the Fourth Proportional to 213,891.40, 320,837.10 and 108,915.40

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Solution

The fourth proportional to 213,891.40, 320,837.10 and 108,915.40 is: 163,373.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    213,891.40 : 320,837.10 = 108,915.40 : x
  2. Step 2: Convert to fraction form
    213,891.40/320,837.10 = 108,915.40/x
  3. Step 3: Cross multiply
    213,891.40x = 320,837.10 × 108,915.40
  4. Step 4: Simplify right side
    213,891.40x = 34,944,101,081.34
  5. Step 5: Solve for x
    x = 34,944,101,081.34/213,891.40
  6. Step 6: Final answer
    x = 163,373.10

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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.