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Finding the Fourth Proportional to 6,429.80, 9,644.70 and 6,386.60

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Solution

The fourth proportional to 6,429.80, 9,644.70 and 6,386.60 is: 9,579.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,429.80 : 9,644.70 = 6,386.60 : x
  2. Step 2: Convert to fraction form
    6,429.80/9,644.70 = 6,386.60/x
  3. Step 3: Cross multiply
    6,429.80x = 9,644.70 × 6,386.60
  4. Step 4: Simplify right side
    6,429.80x = 61,596,841.02
  5. Step 5: Solve for x
    x = 61,596,841.02/6,429.80
  6. Step 6: Final answer
    x = 9,579.90

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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.