Home / 643,279.20-964,918.80-288,985.20

Finding the Fourth Proportional to 643,279.20, 964,918.80 and 288,985.20

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Solution

The fourth proportional to 643,279.20, 964,918.80 and 288,985.20 is: 433,477.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,279.20 : 964,918.80 = 288,985.20 : x
  2. Step 2: Convert to fraction form
    643,279.20/964,918.80 = 288,985.20/x
  3. Step 3: Cross multiply
    643,279.20x = 964,918.80 × 288,985.20
  4. Step 4: Simplify right side
    643,279.20x = 278,847,252,401.76
  5. Step 5: Solve for x
    x = 278,847,252,401.76/643,279.20
  6. Step 6: Final answer
    x = 433,477.80

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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.