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Finding the Fourth Proportional to 28,378.61, 42,567.95 and 8,656.12

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Solution

The fourth proportional to 28,378.61, 42,567.95 and 8,656.12 is: 12,984.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,378.61 : 42,567.95 = 8,656.12 : x
  2. Step 2: Convert to fraction form
    28,378.61/42,567.95 = 8,656.12/x
  3. Step 3: Cross multiply
    28,378.61x = 42,567.95 × 8,656.12
  4. Step 4: Simplify right side
    28,378.61x = 368,473,283.35
  5. Step 5: Solve for x
    x = 368,473,283.35/28,378.61
  6. Step 6: Final answer
    x = 12,984.19

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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.