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Finding the Fourth Proportional to 14,079.90, 19,430.06 and 8,490.90

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Solution

The fourth proportional to 14,079.90, 19,430.06 and 8,490.90 is: 11,717.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,079.90 : 19,430.06 = 8,490.90 : x
  2. Step 2: Convert to fraction form
    14,079.90/19,430.06 = 8,490.90/x
  3. Step 3: Cross multiply
    14,079.90x = 19,430.06 × 8,490.90
  4. Step 4: Simplify right side
    14,079.90x = 164,978,696.45
  5. Step 5: Solve for x
    x = 164,978,696.45/14,079.90
  6. Step 6: Final answer
    x = 11,717.32

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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.