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Finding the Fourth Proportional to 7,120.32, 9,818.64 and 5,140.32

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Solution

The fourth proportional to 7,120.32, 9,818.64 and 5,140.32 is: 7,088.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,120.32 : 9,818.64 = 5,140.32 : x
  2. Step 2: Convert to fraction form
    7,120.32/9,818.64 = 5,140.32/x
  3. Step 3: Cross multiply
    7,120.32x = 9,818.64 × 5,140.32
  4. Step 4: Simplify right side
    7,120.32x = 50,470,951.56
  5. Step 5: Solve for x
    x = 50,470,951.56/7,120.32
  6. Step 6: Final answer
    x = 7,088.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.