Home / 643,293.20-964,939.80-288,999.20

Finding the Fourth Proportional to 643,293.20, 964,939.80 and 288,999.20

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Solution

The fourth proportional to 643,293.20, 964,939.80 and 288,999.20 is: 433,498.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,293.20 : 964,939.80 = 288,999.20 : x
  2. Step 2: Convert to fraction form
    643,293.20/964,939.80 = 288,999.20/x
  3. Step 3: Cross multiply
    643,293.20x = 964,939.80 × 288,999.20
  4. Step 4: Simplify right side
    643,293.20x = 278,866,830,248.16
  5. Step 5: Solve for x
    x = 278,866,830,248.16/643,293.20
  6. Step 6: Final answer
    x = 433,498.80

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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.