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Finding the Fourth Proportional to 102,590.60, 153,535.80 and 85,969.40

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Solution

The fourth proportional to 102,590.60, 153,535.80 and 85,969.40 is: 128,660.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,590.60 : 153,535.80 = 85,969.40 : x
  2. Step 2: Convert to fraction form
    102,590.60/153,535.80 = 85,969.40/x
  3. Step 3: Cross multiply
    102,590.60x = 153,535.80 × 85,969.40
  4. Step 4: Simplify right side
    102,590.60x = 13,199,380,604.52
  5. Step 5: Solve for x
    x = 13,199,380,604.52/102,590.60
  6. Step 6: Final answer
    x = 128,660.72

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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.