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Finding the Fourth Proportional to 28,566.40, 39,422.88 and 15,990.88

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Solution

The fourth proportional to 28,566.40, 39,422.88 and 15,990.88 is: 22,068.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,566.40 : 39,422.88 = 15,990.88 : x
  2. Step 2: Convert to fraction form
    28,566.40/39,422.88 = 15,990.88/x
  3. Step 3: Cross multiply
    28,566.40x = 39,422.88 × 15,990.88
  4. Step 4: Simplify right side
    28,566.40x = 630,406,543.33
  5. Step 5: Solve for x
    x = 630,406,543.33/28,566.40
  6. Step 6: Final answer
    x = 22,068.11

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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.