Home / 145,412.20-218,118.30-86,429.80

Finding the Fourth Proportional to 145,412.20, 218,118.30 and 86,429.80

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Solution

The fourth proportional to 145,412.20, 218,118.30 and 86,429.80 is: 129,644.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,412.20 : 218,118.30 = 86,429.80 : x
  2. Step 2: Convert to fraction form
    145,412.20/218,118.30 = 86,429.80/x
  3. Step 3: Cross multiply
    145,412.20x = 218,118.30 × 86,429.80
  4. Step 4: Simplify right side
    145,412.20x = 18,851,921,045.34
  5. Step 5: Solve for x
    x = 18,851,921,045.34/145,412.20
  6. Step 6: Final answer
    x = 129,644.70

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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.