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Finding the Fourth Proportional to 6,990.78, 9,639.69 and 4,748.19

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Solution

The fourth proportional to 6,990.78, 9,639.69 and 4,748.19 is: 6,547.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,990.78 : 9,639.69 = 4,748.19 : x
  2. Step 2: Convert to fraction form
    6,990.78/9,639.69 = 4,748.19/x
  3. Step 3: Cross multiply
    6,990.78x = 9,639.69 × 4,748.19
  4. Step 4: Simplify right side
    6,990.78x = 45,771,079.66
  5. Step 5: Solve for x
    x = 45,771,079.66/6,990.78
  6. Step 6: Final answer
    x = 6,547.35

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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.