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Finding the Fourth Proportional to 9,611.60, 14,417.40 and 8,421.20

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Solution

The fourth proportional to 9,611.60, 14,417.40 and 8,421.20 is: 12,631.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,611.60 : 14,417.40 = 8,421.20 : x
  2. Step 2: Convert to fraction form
    9,611.60/14,417.40 = 8,421.20/x
  3. Step 3: Cross multiply
    9,611.60x = 14,417.40 × 8,421.20
  4. Step 4: Simplify right side
    9,611.60x = 121,411,808.88
  5. Step 5: Solve for x
    x = 121,411,808.88/9,611.60
  6. Step 6: Final answer
    x = 12,631.80

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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.