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Finding the Fourth Proportional to 9,920.40, 14,880.60 and 9,045.60

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Solution

The fourth proportional to 9,920.40, 14,880.60 and 9,045.60 is: 13,568.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,920.40 : 14,880.60 = 9,045.60 : x
  2. Step 2: Convert to fraction form
    9,920.40/14,880.60 = 9,045.60/x
  3. Step 3: Cross multiply
    9,920.40x = 14,880.60 × 9,045.60
  4. Step 4: Simplify right side
    9,920.40x = 134,603,955.36
  5. Step 5: Solve for x
    x = 134,603,955.36/9,920.40
  6. Step 6: Final answer
    x = 13,568.40

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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.