Home / 918,107.20-1,377,160.80-420,443.20

Finding the Fourth Proportional to 918,107.20, 1,377,160.80 and 420,443.20

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Solution

The fourth proportional to 918,107.20, 1,377,160.80 and 420,443.20 is: 630,664.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    918,107.20 : 1,377,160.80 = 420,443.20 : x
  2. Step 2: Convert to fraction form
    918,107.20/1,377,160.80 = 420,443.20/x
  3. Step 3: Cross multiply
    918,107.20x = 1,377,160.80 × 420,443.20
  4. Step 4: Simplify right side
    918,107.20x = 579,017,893,666.56
  5. Step 5: Solve for x
    x = 579,017,893,666.56/918,107.20
  6. Step 6: Final answer
    x = 630,664.80

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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.