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Finding the Fourth Proportional to 142,705.40, 214,058.10 and 87,409.40

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Solution

The fourth proportional to 142,705.40, 214,058.10 and 87,409.40 is: 131,114.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,705.40 : 214,058.10 = 87,409.40 : x
  2. Step 2: Convert to fraction form
    142,705.40/214,058.10 = 87,409.40/x
  3. Step 3: Cross multiply
    142,705.40x = 214,058.10 × 87,409.40
  4. Step 4: Simplify right side
    142,705.40x = 18,710,690,086.14
  5. Step 5: Solve for x
    x = 18,710,690,086.14/142,705.40
  6. Step 6: Final answer
    x = 131,114.10

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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.