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Finding the Fourth Proportional to 102,588.80, 153,980.40 and 87,814.40

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Solution

The fourth proportional to 102,588.80, 153,980.40 and 87,814.40 is: 131,804.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,588.80 : 153,980.40 = 87,814.40 : x
  2. Step 2: Convert to fraction form
    102,588.80/153,980.40 = 87,814.40/x
  3. Step 3: Cross multiply
    102,588.80x = 153,980.40 × 87,814.40
  4. Step 4: Simplify right side
    102,588.80x = 13,521,696,437.76
  5. Step 5: Solve for x
    x = 13,521,696,437.76/102,588.80
  6. Step 6: Final answer
    x = 131,804.80

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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.