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Finding the Fourth Proportional to 7,239, 9,990.32 and 4,095.20

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Solution

The fourth proportional to 7,239, 9,990.32 and 4,095.20 is: 5,651.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,239 : 9,990.32 = 4,095.20 : x
  2. Step 2: Convert to fraction form
    7,239/9,990.32 = 4,095.20/x
  3. Step 3: Cross multiply
    7,239x = 9,990.32 × 4,095.20
  4. Step 4: Simplify right side
    7,239x = 40,912,358.46
  5. Step 5: Solve for x
    x = 40,912,358.46/7,239
  6. Step 6: Final answer
    x = 5,651.66

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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.