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Finding the Fourth Proportional to 612,205.80, 918,308.70 and 413,140.20

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Solution

The fourth proportional to 612,205.80, 918,308.70 and 413,140.20 is: 619,710.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,205.80 : 918,308.70 = 413,140.20 : x
  2. Step 2: Convert to fraction form
    612,205.80/918,308.70 = 413,140.20/x
  3. Step 3: Cross multiply
    612,205.80x = 918,308.70 × 413,140.20
  4. Step 4: Simplify right side
    612,205.80x = 379,390,239,979.74
  5. Step 5: Solve for x
    x = 379,390,239,979.74/612,205.80
  6. Step 6: Final answer
    x = 619,710.30

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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.