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Finding the Fourth Proportional to 15,019.05, 21,000.75 and 15,019.05

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Solution

The fourth proportional to 15,019.05, 21,000.75 and 15,019.05 is: 21,000.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,019.05 : 21,000.75 = 15,019.05 : x
  2. Step 2: Convert to fraction form
    15,019.05/21,000.75 = 15,019.05/x
  3. Step 3: Cross multiply
    15,019.05x = 21,000.75 × 15,019.05
  4. Step 4: Simplify right side
    15,019.05x = 315,411,314.29
  5. Step 5: Solve for x
    x = 315,411,314.29/15,019.05
  6. Step 6: Final answer
    x = 21,000.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.