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Finding the Fourth Proportional to 102,690.20, 153,816.60 and 83,007.20

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Solution

The fourth proportional to 102,690.20, 153,816.60 and 83,007.20 is: 124,334.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,690.20 : 153,816.60 = 83,007.20 : x
  2. Step 2: Convert to fraction form
    102,690.20/153,816.60 = 83,007.20/x
  3. Step 3: Cross multiply
    102,690.20x = 153,816.60 × 83,007.20
  4. Step 4: Simplify right side
    102,690.20x = 12,767,885,279.52
  5. Step 5: Solve for x
    x = 12,767,885,279.52/102,690.20
  6. Step 6: Final answer
    x = 124,334.02

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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.