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Finding the Fourth Proportional to 8,918.76, 13,386.87 and 7,447.39

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Solution

The fourth proportional to 8,918.76, 13,386.87 and 7,447.39 is: 11,178.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,918.76 : 13,386.87 = 7,447.39 : x
  2. Step 2: Convert to fraction form
    8,918.76/13,386.87 = 7,447.39/x
  3. Step 3: Cross multiply
    8,918.76x = 13,386.87 × 7,447.39
  4. Step 4: Simplify right side
    8,918.76x = 99,697,283.60
  5. Step 5: Solve for x
    x = 99,697,283.60/8,918.76
  6. Step 6: Final answer
    x = 11,178.38

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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.