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Finding the Fourth Proportional to 28,307.84, 39,066.12 and 15,731.84

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Solution

The fourth proportional to 28,307.84, 39,066.12 and 15,731.84 is: 21,710.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,307.84 : 39,066.12 = 15,731.84 : x
  2. Step 2: Convert to fraction form
    28,307.84/39,066.12 = 15,731.84/x
  3. Step 3: Cross multiply
    28,307.84x = 39,066.12 × 15,731.84
  4. Step 4: Simplify right side
    28,307.84x = 614,581,949.26
  5. Step 5: Solve for x
    x = 614,581,949.26/28,307.84
  6. Step 6: Final answer
    x = 21,710.66

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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.