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Finding the Fourth Proportional to 28,890.56, 39,866.04 and 16,312.88

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Solution

The fourth proportional to 28,890.56, 39,866.04 and 16,312.88 is: 22,510.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,890.56 : 39,866.04 = 16,312.88 : x
  2. Step 2: Convert to fraction form
    28,890.56/39,866.04 = 16,312.88/x
  3. Step 3: Cross multiply
    28,890.56x = 39,866.04 × 16,312.88
  4. Step 4: Simplify right side
    28,890.56x = 650,329,926.60
  5. Step 5: Solve for x
    x = 650,329,926.60/28,890.56
  6. Step 6: Final answer
    x = 22,510.12

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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.