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Finding the Fourth Proportional to 12,390.72, 18,587.72 and 6,547.56

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Solution

The fourth proportional to 12,390.72, 18,587.72 and 6,547.56 is: 9,822.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,390.72 : 18,587.72 = 6,547.56 : x
  2. Step 2: Convert to fraction form
    12,390.72/18,587.72 = 6,547.56/x
  3. Step 3: Cross multiply
    12,390.72x = 18,587.72 × 6,547.56
  4. Step 4: Simplify right side
    12,390.72x = 121,704,211.96
  5. Step 5: Solve for x
    x = 121,704,211.96/12,390.72
  6. Step 6: Final answer
    x = 9,822.21

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.