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Finding the Fourth Proportional to 28,656.88, 42,985.62 and 8,666.55

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Solution

The fourth proportional to 28,656.88, 42,985.62 and 8,666.55 is: 12,999.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,656.88 : 42,985.62 = 8,666.55 : x
  2. Step 2: Convert to fraction form
    28,656.88/42,985.62 = 8,666.55/x
  3. Step 3: Cross multiply
    28,656.88x = 42,985.62 × 8,666.55
  4. Step 4: Simplify right side
    28,656.88x = 372,537,025.01
  5. Step 5: Solve for x
    x = 372,537,025.01/28,656.88
  6. Step 6: Final answer
    x = 12,999.92

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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.