Home / 28,920.84-39,899.70-21,385.32

Finding the Fourth Proportional to 28,920.84, 39,899.70 and 21,385.32

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Solution

The fourth proportional to 28,920.84, 39,899.70 and 21,385.32 is: 29,503.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,920.84 : 39,899.70 = 21,385.32 : x
  2. Step 2: Convert to fraction form
    28,920.84/39,899.70 = 21,385.32/x
  3. Step 3: Cross multiply
    28,920.84x = 39,899.70 × 21,385.32
  4. Step 4: Simplify right side
    28,920.84x = 853,267,852.40
  5. Step 5: Solve for x
    x = 853,267,852.40/28,920.84
  6. Step 6: Final answer
    x = 29,503.56

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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.