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Finding the Fourth Proportional to 143,279.10, 214,918.65 and 72,420.30

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Solution

The fourth proportional to 143,279.10, 214,918.65 and 72,420.30 is: 108,630.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,279.10 : 214,918.65 = 72,420.30 : x
  2. Step 2: Convert to fraction form
    143,279.10/214,918.65 = 72,420.30/x
  3. Step 3: Cross multiply
    143,279.10x = 214,918.65 × 72,420.30
  4. Step 4: Simplify right side
    143,279.10x = 15,564,473,108.60
  5. Step 5: Solve for x
    x = 15,564,473,108.60/143,279.10
  6. Step 6: Final answer
    x = 108,630.45

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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.