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Finding the Fourth Proportional to 28,606.40, 42,911.76 and 8,886.40

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Solution

The fourth proportional to 28,606.40, 42,911.76 and 8,886.40 is: 13,330.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,606.40 : 42,911.76 = 8,886.40 : x
  2. Step 2: Convert to fraction form
    28,606.40/42,911.76 = 8,886.40/x
  3. Step 3: Cross multiply
    28,606.40x = 42,911.76 × 8,886.40
  4. Step 4: Simplify right side
    28,606.40x = 381,331,064.06
  5. Step 5: Solve for x
    x = 381,331,064.06/28,606.40
  6. Step 6: Final answer
    x = 13,330.27

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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.