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Finding the Fourth Proportional to 19,312.90, 28,990.95 and 18,043.90

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Solution

The fourth proportional to 19,312.90, 28,990.95 and 18,043.90 is: 27,086.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,312.90 : 28,990.95 = 18,043.90 : x
  2. Step 2: Convert to fraction form
    19,312.90/28,990.95 = 18,043.90/x
  3. Step 3: Cross multiply
    19,312.90x = 28,990.95 × 18,043.90
  4. Step 4: Simplify right side
    19,312.90x = 523,109,802.71
  5. Step 5: Solve for x
    x = 523,109,802.71/19,312.90
  6. Step 6: Final answer
    x = 27,086.03

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.