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Finding the Fourth Proportional to 612,137.20, 918,205.80 and 423,180.40

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Solution

The fourth proportional to 612,137.20, 918,205.80 and 423,180.40 is: 634,770.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,137.20 : 918,205.80 = 423,180.40 : x
  2. Step 2: Convert to fraction form
    612,137.20/918,205.80 = 423,180.40/x
  3. Step 3: Cross multiply
    612,137.20x = 918,205.80 × 423,180.40
  4. Step 4: Simplify right side
    612,137.20x = 388,566,697,726.32
  5. Step 5: Solve for x
    x = 388,566,697,726.32/612,137.20
  6. Step 6: Final answer
    x = 634,770.60

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Double scale
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Similar ratio
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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.