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Finding the Fourth Proportional to 28,560, 39,430.08 and 18,641.28

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Solution

The fourth proportional to 28,560, 39,430.08 and 18,641.28 is: 25,736.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,560 : 39,430.08 = 18,641.28 : x
  2. Step 2: Convert to fraction form
    28,560/39,430.08 = 18,641.28/x
  3. Step 3: Cross multiply
    28,560x = 39,430.08 × 18,641.28
  4. Step 4: Simplify right side
    28,560x = 735,027,161.70
  5. Step 5: Solve for x
    x = 735,027,161.70/28,560
  6. Step 6: Final answer
    x = 25,736.25

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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.