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Finding the Fourth Proportional to 9,415.64, 12,992.24 and 5,637.92

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Solution

The fourth proportional to 9,415.64, 12,992.24 and 5,637.92 is: 7,779.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,415.64 : 12,992.24 = 5,637.92 : x
  2. Step 2: Convert to fraction form
    9,415.64/12,992.24 = 5,637.92/x
  3. Step 3: Cross multiply
    9,415.64x = 12,992.24 × 5,637.92
  4. Step 4: Simplify right side
    9,415.64x = 73,249,209.74
  5. Step 5: Solve for x
    x = 73,249,209.74/9,415.64
  6. Step 6: Final answer
    x = 7,779.53

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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.