Home / 8,487.40-11,715.78-5,345.80

Finding the Fourth Proportional to 8,487.40, 11,715.78 and 5,345.80

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Solution

The fourth proportional to 8,487.40, 11,715.78 and 5,345.80 is: 7,379.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,487.40 : 11,715.78 = 5,345.80 : x
  2. Step 2: Convert to fraction form
    8,487.40/11,715.78 = 5,345.80/x
  3. Step 3: Cross multiply
    8,487.40x = 11,715.78 × 5,345.80
  4. Step 4: Simplify right side
    8,487.40x = 62,630,216.72
  5. Step 5: Solve for x
    x = 62,630,216.72/8,487.40
  6. Step 6: Final answer
    x = 7,379.20

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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.