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Finding the Fourth Proportional to 28,465.89, 42,698.74 and 7,689.39

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Solution

The fourth proportional to 28,465.89, 42,698.74 and 7,689.39 is: 11,534.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,465.89 : 42,698.74 = 7,689.39 : x
  2. Step 2: Convert to fraction form
    28,465.89/42,698.74 = 7,689.39/x
  3. Step 3: Cross multiply
    28,465.89x = 42,698.74 × 7,689.39
  4. Step 4: Simplify right side
    28,465.89x = 328,327,031.65
  5. Step 5: Solve for x
    x = 328,327,031.65/28,465.89
  6. Step 6: Final answer
    x = 11,534.05

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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.