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Finding the Fourth Proportional to 140,530.10, 210,831.15 and 81,259.70

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Solution

The fourth proportional to 140,530.10, 210,831.15 and 81,259.70 is: 121,910.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    140,530.10 : 210,831.15 = 81,259.70 : x
  2. Step 2: Convert to fraction form
    140,530.10/210,831.15 = 81,259.70/x
  3. Step 3: Cross multiply
    140,530.10x = 210,831.15 × 81,259.70
  4. Step 4: Simplify right side
    140,530.10x = 17,132,075,999.66
  5. Step 5: Solve for x
    x = 17,132,075,999.66/140,530.10
  6. Step 6: Final answer
    x = 121,910.37

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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.