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Finding the Fourth Proportional to 612,139.20, 918,208.80 and 543,904.80

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Solution

The fourth proportional to 612,139.20, 918,208.80 and 543,904.80 is: 815,857.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,139.20 : 918,208.80 = 543,904.80 : x
  2. Step 2: Convert to fraction form
    612,139.20/918,208.80 = 543,904.80/x
  3. Step 3: Cross multiply
    612,139.20x = 918,208.80 × 543,904.80
  4. Step 4: Simplify right side
    612,139.20x = 499,418,173,722.24
  5. Step 5: Solve for x
    x = 499,418,173,722.24/612,139.20
  6. Step 6: Final answer
    x = 815,857.20

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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.