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Finding the Fourth Proportional to 6,487.40, 9,714.90 and 4,284.20

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Solution

The fourth proportional to 6,487.40, 9,714.90 and 4,284.20 is: 6,415.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,487.40 : 9,714.90 = 4,284.20 : x
  2. Step 2: Convert to fraction form
    6,487.40/9,714.90 = 4,284.20/x
  3. Step 3: Cross multiply
    6,487.40x = 9,714.90 × 4,284.20
  4. Step 4: Simplify right side
    6,487.40x = 41,620,574.58
  5. Step 5: Solve for x
    x = 41,620,574.58/6,487.40
  6. Step 6: Final answer
    x = 6,415.60

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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.