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Finding the Fourth Proportional to 8,916.61, 12,304.64 and 5,139.79

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Solution

The fourth proportional to 8,916.61, 12,304.64 and 5,139.79 is: 7,092.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,916.61 : 12,304.64 = 5,139.79 : x
  2. Step 2: Convert to fraction form
    8,916.61/12,304.64 = 5,139.79/x
  3. Step 3: Cross multiply
    8,916.61x = 12,304.64 × 5,139.79
  4. Step 4: Simplify right side
    8,916.61x = 63,243,265.63
  5. Step 5: Solve for x
    x = 63,243,265.63/8,916.61
  6. Step 6: Final answer
    x = 7,092.75

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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.