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Finding the Fourth Proportional to 9,980.40, 14,954.40 and 8,587.20

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Solution

The fourth proportional to 9,980.40, 14,954.40 and 8,587.20 is: 12,866.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,980.40 : 14,954.40 = 8,587.20 : x
  2. Step 2: Convert to fraction form
    9,980.40/14,954.40 = 8,587.20/x
  3. Step 3: Cross multiply
    9,980.40x = 14,954.40 × 8,587.20
  4. Step 4: Simplify right side
    9,980.40x = 128,416,423.68
  5. Step 5: Solve for x
    x = 128,416,423.68/9,980.40
  6. Step 6: Final answer
    x = 12,866.86

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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.