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Finding the Fourth Proportional to 28,360.56, 42,547.16 and 8,640.64

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Solution

The fourth proportional to 28,360.56, 42,547.16 and 8,640.64 is: 12,962.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,360.56 : 42,547.16 = 8,640.64 : x
  2. Step 2: Convert to fraction form
    28,360.56/42,547.16 = 8,640.64/x
  3. Step 3: Cross multiply
    28,360.56x = 42,547.16 × 8,640.64
  4. Step 4: Simplify right side
    28,360.56x = 367,634,692.58
  5. Step 5: Solve for x
    x = 367,634,692.58/28,360.56
  6. Step 6: Final answer
    x = 12,962.89

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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.