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Finding the Fourth Proportional to 28,785, 39,740.58 and 18,866.28

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Solution

The fourth proportional to 28,785, 39,740.58 and 18,866.28 is: 26,046.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,785 : 39,740.58 = 18,866.28 : x
  2. Step 2: Convert to fraction form
    28,785/39,740.58 = 18,866.28/x
  3. Step 3: Cross multiply
    28,785x = 39,740.58 × 18,866.28
  4. Step 4: Simplify right side
    28,785x = 749,756,909.64
  5. Step 5: Solve for x
    x = 749,756,909.64/28,785
  6. Step 6: Final answer
    x = 26,046.79

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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.