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Finding the Fourth Proportional to 6,642.36, 9,885.12 and 6,420.92

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Solution

The fourth proportional to 6,642.36, 9,885.12 and 6,420.92 is: 9,555.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,642.36 : 9,885.12 = 6,420.92 : x
  2. Step 2: Convert to fraction form
    6,642.36/9,885.12 = 6,420.92/x
  3. Step 3: Cross multiply
    6,642.36x = 9,885.12 × 6,420.92
  4. Step 4: Simplify right side
    6,642.36x = 63,471,564.71
  5. Step 5: Solve for x
    x = 63,471,564.71/6,642.36
  6. Step 6: Final answer
    x = 9,555.57

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.