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Finding the Fourth Proportional to 142,436.70, 213,808.65 and 80,228.70

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Solution

The fourth proportional to 142,436.70, 213,808.65 and 80,228.70 is: 120,429.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,436.70 : 213,808.65 = 80,228.70 : x
  2. Step 2: Convert to fraction form
    142,436.70/213,808.65 = 80,228.70/x
  3. Step 3: Cross multiply
    142,436.70x = 213,808.65 × 80,228.70
  4. Step 4: Simplify right side
    142,436.70x = 17,153,590,038.26
  5. Step 5: Solve for x
    x = 17,153,590,038.26/142,436.70
  6. Step 6: Final answer
    x = 120,429.57

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1.5x scale

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.