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Finding the Fourth Proportional to 9,909.40, 14,864.64 and 7,128.40

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Solution

The fourth proportional to 9,909.40, 14,864.64 and 7,128.40 is: 10,692.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,909.40 : 14,864.64 = 7,128.40 : x
  2. Step 2: Convert to fraction form
    9,909.40/14,864.64 = 7,128.40/x
  3. Step 3: Cross multiply
    9,909.40x = 14,864.64 × 7,128.40
  4. Step 4: Simplify right side
    9,909.40x = 105,961,099.78
  5. Step 5: Solve for x
    x = 105,961,099.78/9,909.40
  6. Step 6: Final answer
    x = 10,692.99

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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.